diff --git a/.node-version b/.node-version
new file mode 100644
index 000000000..ad8f8733d
--- /dev/null
+++ b/.node-version
@@ -0,0 +1 @@
+v8.9.1
diff --git a/.travis.yml b/.travis.yml
index eb47674bf..c77869134 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,14 +3,15 @@ sudo: required
 group: beta
 language: node_js
 node_js:
-  - "6"
+  - "8"
 cache:
-  yarn: true
+  directories:
+    - node_modules
 before_script:
   - truffle version
-  - yarn list
+  - npm list
 script:
-  - yarn test
+  - npm test
 notifications:
   slack:
     rooms:
diff --git a/README.md b/README.md
index 13cfd217b..e8a2592c2 100644
--- a/README.md
+++ b/README.md
@@ -25,9 +25,6 @@ To install the OpenZeppelin library, run:
 ```sh
 npm init
 npm install zeppelin-solidity
-
-# If you are using yarn, add dependency like this -
-yarn add zeppelin-solidity
 ```
 
 After that, you'll get all the library's contracts in the `node_modules/zeppelin-solidity/contracts` folder. You can use the contracts in the library like so:
diff --git a/docs/source/getting-started.rst b/docs/source/getting-started.rst
index 89c47ed9a..d0c6ef708 100644
--- a/docs/source/getting-started.rst
+++ b/docs/source/getting-started.rst
@@ -12,10 +12,6 @@ To install the OpenZeppelin library, run::
 	npm init # follow instructions
 	npm install zeppelin-solidity
 
-	# If you are using yarn, add dependency like this -
-	yarn add zeppelin-solidity
-
-
 After that, you'll get all the library's contracts in the `node_modules/zeppelin-solidity/contracts` folder. You can use the contracts in the library like so::
 
 	import "zeppelin-solidity/contracts/ownership/Ownable.sol";
diff --git a/package-lock.json b/package-lock.json
index 8e59bae22..435e645db 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "zeppelin-solidity",
-  "version": "1.3.0",
+  "version": "1.4.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -98,7 +98,7 @@
     "anymatch": {
       "version": "1.3.2",
       "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-1.3.2.tgz",
-      "integrity": "sha512-0XNayC8lTHQ2OI8aljNCN3sSx6hsr/1+rlcDAotXJR7C1oZZHCNsfpbKwMjRA3Uqb5tF1Rae2oloTr4xpq+WjA==",
+      "integrity": "sha1-VT3Lj5HjyImEXf26NMd3IbkLnXo=",
       "dev": true,
       "requires": {
         "micromatch": "2.3.11",
@@ -142,7 +142,7 @@
     "arr-flatten": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/arr-flatten/-/arr-flatten-1.1.0.tgz",
-      "integrity": "sha512-L3hKV5R/p5o81R7O02IGnwpDmkp6E982XhtbuwSe3O4qOtMMMtodicASA1Cny2U+aCXcNpml+m4dPsvsJ3jatg==",
+      "integrity": "sha1-NgSLv/TntH4TZkQxbJlmnqWukfE=",
       "dev": true
     },
     "array-unique": {
@@ -1014,7 +1014,7 @@
     "base64-js": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.2.1.tgz",
-      "integrity": "sha512-dwVUVIXsBZXwTuwnXI9RK8sBmgq09NDHzyR9SAph9eqk76gKK2JSQmZARC2zRC81JC2QTtxD0ARU5qTS25gIGw==",
+      "integrity": "sha1-qRlH2h9KUW6jjltOwOw3c2deCIY=",
       "dev": true
     },
     "bcrypt-pbkdf": {
@@ -1042,7 +1042,7 @@
     "bindings": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/bindings/-/bindings-1.3.0.tgz",
-      "integrity": "sha512-DpLh5EzMR2kzvX1KIlVC0VkC3iZtHKTgdtZ0a3pglBZdaQFjt5S9g9xd1lE+YvXyfd6mtCeRnrUfOLYiTMlNSw==",
+      "integrity": "sha1-s0b27PapX1qBXFg5/HzbIlAvHtc=",
       "dev": true
     },
     "bip39": {
@@ -1078,7 +1078,7 @@
     "bn.js": {
       "version": "4.11.8",
       "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.8.tgz",
-      "integrity": "sha512-ItfYfPLkWHUjckQCk8xC+LwxgK8NYcXywGigJgSwOP8Y2iyWT4f2vsZnoOXTTbo+o5yXmIUJ4gn5538SO5S3gA==",
+      "integrity": "sha1-LN4J617jQfSEdGuwMJsyU7GxRC8=",
       "dev": true
     },
     "boom": {
@@ -1288,7 +1288,7 @@
     "chai-as-promised": {
       "version": "7.1.1",
       "resolved": "https://registry.npmjs.org/chai-as-promised/-/chai-as-promised-7.1.1.tgz",
-      "integrity": "sha512-azL6xMoi+uxu6z4rhWQ1jbdUhOMhis2PvscD/xjLqNMkv3BPPp2JyyuTHOrf9BOosGpNQ11v6BKv/g57RXbiaA==",
+      "integrity": "sha1-CGRdgl3rhpbuYXJdv1kMAS6wDKA=",
       "dev": true,
       "requires": {
         "check-error": "1.0.2"
@@ -1336,6 +1336,7 @@
       "requires": {
         "anymatch": "1.3.2",
         "async-each": "1.0.1",
+        "fsevents": "1.1.3",
         "glob-parent": "2.0.0",
         "inherits": "2.0.3",
         "is-binary-path": "1.0.1",
@@ -1353,7 +1354,7 @@
     "cipher-base": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/cipher-base/-/cipher-base-1.0.4.tgz",
-      "integrity": "sha512-Kkht5ye6ZGmwv40uUDZztayT2ThLQGfnj/T71N/XzeZeo3nf8foyW7zGTsPYkEya3m5f3cAypH+qe7YOrM1U2Q==",
+      "integrity": "sha1-h2Dk7MJy9MNjUy+SbYdKriwTl94=",
       "dev": true,
       "requires": {
         "inherits": "2.0.3",
@@ -1671,7 +1672,7 @@
     "deferred-leveldown": {
       "version": "1.2.2",
       "resolved": "https://registry.npmjs.org/deferred-leveldown/-/deferred-leveldown-1.2.2.tgz",
-      "integrity": "sha512-uukrWD2bguRtXilKt6cAWKyoXrTSMo5m7crUdLfWQmu8kIm88w3QZoUL+6nhpfKVmhHANER6Re3sKoNoZ3IKMA==",
+      "integrity": "sha1-Os0uC3XRZpkkvApLZChRExFz4es=",
       "dev": true,
       "requires": {
         "abstract-leveldown": "2.6.2"
@@ -2447,6 +2448,910 @@
       "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8=",
       "dev": true
     },
+    "fsevents": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-1.1.3.tgz",
+      "integrity": "sha512-WIr7iDkdmdbxu/Gh6eKEZJL6KPE74/5MEsf2whTOFNxbIoIixogroLdKYqB6FDav4Wavh/lZdzzd3b2KxIXC5Q==",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "nan": "2.6.2",
+        "node-pre-gyp": "0.6.39"
+      },
+      "dependencies": {
+        "abbrev": {
+          "version": "1.1.0",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "ajv": {
+          "version": "4.11.8",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "co": "4.6.0",
+            "json-stable-stringify": "1.0.1"
+          }
+        },
+        "ansi-regex": {
+          "version": "2.1.1",
+          "bundled": true,
+          "dev": true
+        },
+        "aproba": {
+          "version": "1.1.1",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "are-we-there-yet": {
+          "version": "1.1.4",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "delegates": "1.0.0",
+            "readable-stream": "2.2.9"
+          }
+        },
+        "asn1": {
+          "version": "0.2.3",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "assert-plus": {
+          "version": "0.2.0",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "asynckit": {
+          "version": "0.4.0",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "aws-sign2": {
+          "version": "0.6.0",
+          "bundled": true,
+          "dev": true,
+          "optional": true
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+        "aws4": {
+          "version": "1.6.0",
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+          "dev": true,
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+        "balanced-match": {
+          "version": "0.4.2",
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+          "dev": true
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+          "version": "1.0.1",
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+          "dev": true,
+          "optional": true,
+          "requires": {
+            "tweetnacl": "0.14.5"
+          }
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+          "version": "0.0.9",
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+          "dev": true,
+          "requires": {
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+          }
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+          "version": "2.10.1",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "hoek": "2.16.3"
+          }
+        },
+        "brace-expansion": {
+          "version": "1.1.7",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "balanced-match": "0.4.2",
+            "concat-map": "0.0.1"
+          }
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+          "version": "1.0.0",
+          "bundled": true,
+          "dev": true
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+          "bundled": true,
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+          "optional": true
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+          "dev": true,
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+          "bundled": true,
+          "dev": true
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+          "version": "2.0.5",
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+          }
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+            "request": "2.81.0",
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+            "semver": "5.3.0",
+            "tar": "2.2.1",
+            "tar-pack": "3.4.0"
+          }
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-          "integrity": "sha512-/6na001MJWEtYxHOV1WLfsmR4YIynkUEhBwzsb+fk2qmQ3iqsi258l/Q2MWHJMImAcNpZ8DEdYAK72NHoIQ9Eg==",
+          "integrity": "sha1-HgSA/jbS2lhY0etqzDhBiybqog0=",
           "dev": true,
           "requires": {
             "browser-stdout": "1.3.0",
@@ -5634,7 +6539,7 @@
     "uuid": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.1.0.tgz",
-      "integrity": "sha512-DIWtzUkw04M4k3bf1IcpS2tngXEL26YUD2M0tMDUpnUrz2hgzUBlD55a4FjdLGPvfHxS6uluGWvaVEqgBcVa+g==",
+      "integrity": "sha1-PdPT55Crwk17DToDT/q6vijrvAQ=",
       "dev": true
     },
     "validate-npm-package-license": {
@@ -5913,7 +6818,7 @@
     "which": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.0.tgz",
-      "integrity": "sha512-xcJpopdamTuY5duC/KnTTNBraPK54YwpenP4lzxU8H91GudWpFv38u0CKjclE1Wi2EH2EDz5LRcHcKbCIzqGyg==",
+      "integrity": "sha1-/wS9/AEO5UfXgL7DjhrBwnd9JTo=",
       "dev": true,
       "requires": {
         "isexe": "2.0.0"
@@ -5928,7 +6833,7 @@
     "wide-align": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.2.tgz",
-      "integrity": "sha512-ijDLlyQ7s6x1JgCLur53osjm/UXUYD9+0PbYKrBsYisYXzCxN+HC3mYDNy/dWdmf3AwqwU3CXwDCvsNgGK1S0w==",
+      "integrity": "sha1-Vx4PGwYEY268DfwhsDObvjE0FxA=",
       "dev": true,
       "requires": {
         "string-width": "1.0.2"
diff --git a/package.json b/package.json
index a0b911b29..1ab9999a1 100644
--- a/package.json
+++ b/package.json
@@ -19,6 +19,9 @@
     "security",
     "zeppelin"
   ],
+  "engines": {
+    "node": ">=8.9.1"
+  },
   "author": "Manuel Araoz <manuelaraoz@gmail.com>",
   "license": "MIT",
   "bugs": {
diff --git a/yarn.lock b/yarn.lock
deleted file mode 100644
index 544021083..000000000
--- a/yarn.lock
+++ /dev/null
@@ -1,4364 +0,0 @@
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-  resolved "https://registry.yarnpkg.com/level-errors/-/level-errors-1.0.5.tgz#83dbfb12f0b8a2516bdc9a31c4876038e227b859"
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-
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-  version "1.3.1"
-  resolved "https://registry.yarnpkg.com/level-iterator-stream/-/level-iterator-stream-1.3.1.tgz#e43b78b1a8143e6fa97a4f485eb8ea530352f2ed"
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-  resolved "https://registry.yarnpkg.com/level-ws/-/level-ws-0.0.0.tgz#372e512177924a00424b0b43aef2bb42496d228b"
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-  resolved "https://registry.yarnpkg.com/levelup/-/levelup-1.3.9.tgz#2dbcae845b2bb2b6bea84df334c475533bbd82ab"
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-  resolved "https://registry.yarnpkg.com/levn/-/levn-0.3.0.tgz#3b09924edf9f083c0490fdd4c0bc4421e04764ee"
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-  resolved "https://registry.yarnpkg.com/load-json-file/-/load-json-file-1.1.0.tgz#956905708d58b4bab4c2261b04f59f31c99374c0"
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-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/load-json-file/-/load-json-file-2.0.0.tgz#7947e42149af80d696cbf797bcaabcfe1fe29ca8"
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-    parse-json "^2.2.0"
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-  resolved "https://registry.yarnpkg.com/loader-runner/-/loader-runner-2.3.0.tgz#f482aea82d543e07921700d5a46ef26fdac6b8a2"
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-  resolved "https://registry.yarnpkg.com/loader-utils/-/loader-utils-1.1.0.tgz#c98aef488bcceda2ffb5e2de646d6a754429f5cd"
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-    json5 "^0.5.0"
-
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-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/locate-path/-/locate-path-2.0.0.tgz#2b568b265eec944c6d9c0de9c3dbbbca0354cd8e"
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-    path-exists "^3.0.0"
-
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-  version "3.2.0"
-  resolved "https://registry.yarnpkg.com/lodash._baseassign/-/lodash._baseassign-3.2.0.tgz#8c38a099500f215ad09e59f1722fd0c52bfe0a4e"
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-    lodash.keys "^3.0.0"
-
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-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/lodash._basecopy/-/lodash._basecopy-3.0.1.tgz#8da0e6a876cf344c0ad8a54882111dd3c5c7ca36"
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-  version "3.0.3"
-  resolved "https://registry.yarnpkg.com/lodash._basecreate/-/lodash._basecreate-3.0.3.tgz#1bc661614daa7fc311b7d03bf16806a0213cf821"
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-  resolved "https://registry.yarnpkg.com/lodash._getnative/-/lodash._getnative-3.9.1.tgz#570bc7dede46d61cdcde687d65d3eecbaa3aaff5"
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-  version "3.0.9"
-  resolved "https://registry.yarnpkg.com/lodash._isiterateecall/-/lodash._isiterateecall-3.0.9.tgz#5203ad7ba425fae842460e696db9cf3e6aac057c"
-
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-  version "4.2.0"
-  resolved "https://registry.yarnpkg.com/lodash.assign/-/lodash.assign-4.2.0.tgz#0d99f3ccd7a6d261d19bdaeb9245005d285808e7"
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-  resolved "https://registry.yarnpkg.com/lodash.create/-/lodash.create-3.1.1.tgz#d7f2849f0dbda7e04682bb8cd72ab022461debe7"
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-    lodash._basecreate "^3.0.0"
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-
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-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/lodash.isarguments/-/lodash.isarguments-3.1.0.tgz#2f573d85c6a24289ff00663b491c1d338ff3458a"
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-  version "3.0.4"
-  resolved "https://registry.yarnpkg.com/lodash.isarray/-/lodash.isarray-3.0.4.tgz#79e4eb88c36a8122af86f844aa9bcd851b5fbb55"
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-  version "3.1.2"
-  resolved "https://registry.yarnpkg.com/lodash.keys/-/lodash.keys-3.1.2.tgz#4dbc0472b156be50a0b286855d1bd0b0c656098a"
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-
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-  version "4.17.4"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.4.tgz#78203a4d1c328ae1d86dca6460e369b57f4055ae"
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-  version "1.2.5"
-  resolved "https://registry.yarnpkg.com/log-driver/-/log-driver-1.2.5.tgz#7ae4ec257302fd790d557cb10c97100d857b0056"
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-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/longest/-/longest-1.0.1.tgz#30a0b2da38f73770e8294a0d22e6625ed77d0097"
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-  version "1.3.1"
-  resolved "https://registry.yarnpkg.com/loose-envify/-/loose-envify-1.3.1.tgz#d1a8ad33fa9ce0e713d65fdd0ac8b748d478c848"
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-  resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-2.7.3.tgz#6d4524e8b955f95d4f5b58851ce21dd72fb4e952"
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-  version "4.1.1"
-  resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-4.1.1.tgz#622e32e82488b49279114a4f9ecf45e7cd6bba55"
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-  version "2.2.0"
-  resolved "https://registry.yarnpkg.com/ltgt/-/ltgt-2.2.0.tgz#b65ba5fcb349a29924c8e333f7c6a5562f2e4842"
-
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-  resolved "https://registry.yarnpkg.com/md5.js/-/md5.js-1.3.4.tgz#e9bdbde94a20a5ac18b04340fc5764d5b09d901d"
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-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/mem/-/mem-1.1.0.tgz#5edd52b485ca1d900fe64895505399a0dfa45f76"
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-
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-  resolved "https://registry.yarnpkg.com/memdown/-/memdown-1.4.1.tgz#b4e4e192174664ffbae41361aa500f3119efe215"
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-  resolved "https://registry.yarnpkg.com/memory-fs/-/memory-fs-0.4.1.tgz#3a9a20b8462523e447cfbc7e8bb80ed667bfc552"
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-  resolved "https://registry.yarnpkg.com/memorystream/-/memorystream-0.3.1.tgz#86d7090b30ce455d63fbae12dda51a47ddcaf9b2"
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-  version "2.2.0"
-  resolved "https://registry.yarnpkg.com/merkle-patricia-tree/-/merkle-patricia-tree-2.2.0.tgz#7a4787b1262ab00fe9b204ab471b005332306efa"
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-
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-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/miller-rabin/-/miller-rabin-4.0.1.tgz#f080351c865b0dc562a8462966daa53543c78a4d"
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-
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-  version "1.30.0"
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-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/mimic-fn/-/mimic-fn-1.1.0.tgz#e667783d92e89dbd342818b5230b9d62a672ad18"
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-  version "2.19.0"
-  resolved "https://registry.yarnpkg.com/min-document/-/min-document-2.19.0.tgz#7bd282e3f5842ed295bb748cdd9f1ffa2c824685"
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-  version "1.0.0"
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-  resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-0.3.0.tgz#275d8edaac4f1bb3326472089e7949c8394699dd"
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-  resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
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-  resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.0.10.tgz#de3f98543dbf96082be48ad1a0c7cda836301dcf"
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-  version "0.5.1"
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-  resolved "https://registry.yarnpkg.com/npmlog/-/npmlog-4.1.2.tgz#08a7f2a8bf734604779a9efa4ad5cc717abb954b"
-  dependencies:
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-    console-control-strings "~1.1.0"
-    gauge "~2.7.3"
-    set-blocking "~2.0.0"
-
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-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/number-is-nan/-/number-is-nan-1.0.1.tgz#097b602b53422a522c1afb8790318336941a011d"
-
-oauth-sign@~0.8.1, oauth-sign@~0.8.2:
-  version "0.8.2"
-  resolved "https://registry.yarnpkg.com/oauth-sign/-/oauth-sign-0.8.2.tgz#46a6ab7f0aead8deae9ec0565780b7d4efeb9d43"
-
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-  version "4.1.1"
-  resolved "https://registry.yarnpkg.com/object-assign/-/object-assign-4.1.1.tgz#2109adc7965887cfc05cbbd442cac8bfbb360863"
-
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-  version "1.3.0"
-  resolved "https://registry.yarnpkg.com/object-inspect/-/object-inspect-1.3.0.tgz#5b1eb8e6742e2ee83342a637034d844928ba2f6d"
-
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-  version "1.0.11"
-  resolved "https://registry.yarnpkg.com/object-keys/-/object-keys-1.0.11.tgz#c54601778ad560f1142ce0e01bcca8b56d13426d"
-
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-  version "0.4.0"
-  resolved "https://registry.yarnpkg.com/object-keys/-/object-keys-0.4.0.tgz#28a6aae7428dd2c3a92f3d95f21335dd204e0336"
-
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-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/object.omit/-/object.omit-2.0.1.tgz#1a9c744829f39dbb858c76ca3579ae2a54ebd1fa"
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-    is-extendable "^0.1.1"
-
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-  version "1.4.0"
-  resolved "https://registry.yarnpkg.com/once/-/once-1.4.0.tgz#583b1aa775961d4b113ac17d9c50baef9dd76bd1"
-  dependencies:
-    wrappy "1"
-
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-  version "0.6.1"
-  resolved "https://registry.yarnpkg.com/optimist/-/optimist-0.6.1.tgz#da3ea74686fa21a19a111c326e90eb15a0196686"
-  dependencies:
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-    wordwrap "~0.0.2"
-
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-  version "0.8.2"
-  resolved "https://registry.yarnpkg.com/optionator/-/optionator-0.8.2.tgz#364c5e409d3f4d6301d6c0b4c05bba50180aeb64"
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-    fast-levenshtein "~2.0.4"
-    levn "~0.3.0"
-    prelude-ls "~1.1.2"
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-    wordwrap "~1.0.0"
-
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-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/original-require/-/original-require-1.0.1.tgz#0f130471584cd33511c5ec38c8d59213f9ac5e20"
-
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-  version "0.3.0"
-  resolved "https://registry.yarnpkg.com/os-browserify/-/os-browserify-0.3.0.tgz#854373c7f5c2315914fc9bfc6bd8238fdda1ec27"
-
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-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/os-homedir/-/os-homedir-1.0.2.tgz#ffbc4988336e0e833de0c168c7ef152121aa7fb3"
-
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-  version "1.4.0"
-  resolved "https://registry.yarnpkg.com/os-locale/-/os-locale-1.4.0.tgz#20f9f17ae29ed345e8bde583b13d2009803c14d9"
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-
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-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/os-locale/-/os-locale-2.1.0.tgz#42bc2900a6b5b8bd17376c8e882b65afccf24bf2"
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-    lcid "^1.0.0"
-    mem "^1.1.0"
-
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-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/os-tmpdir/-/os-tmpdir-1.0.2.tgz#bbe67406c79aa85c5cfec766fe5734555dfa1274"
-
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-  version "0.1.4"
-  resolved "https://registry.yarnpkg.com/osenv/-/osenv-0.1.4.tgz#42fe6d5953df06c8064be6f176c3d05aaaa34644"
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-    os-homedir "^1.0.0"
-    os-tmpdir "^1.0.0"
-
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-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/p-finally/-/p-finally-1.0.0.tgz#3fbcfb15b899a44123b34b6dcc18b724336a2cae"
-
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-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/p-limit/-/p-limit-1.1.0.tgz#b07ff2d9a5d88bec806035895a2bab66a27988bc"
-
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-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/p-locate/-/p-locate-2.0.0.tgz#20a0103b222a70c8fd39cc2e580680f3dde5ec43"
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-    p-limit "^1.1.0"
-
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-  version "1.0.6"
-  resolved "https://registry.yarnpkg.com/pako/-/pako-1.0.6.tgz#0101211baa70c4bca4a0f63f2206e97b7dfaf258"
-
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-  version "5.1.0"
-  resolved "https://registry.yarnpkg.com/parse-asn1/-/parse-asn1-5.1.0.tgz#37c4f9b7ed3ab65c74817b5f2480937fbf97c712"
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-    pbkdf2 "^3.0.3"
-
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-  version "3.0.4"
-  resolved "https://registry.yarnpkg.com/parse-glob/-/parse-glob-3.0.4.tgz#b2c376cfb11f35513badd173ef0bb6e3a388391c"
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-
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-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/parse-headers/-/parse-headers-2.0.1.tgz#6ae83a7aa25a9d9b700acc28698cd1f1ed7e9536"
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-
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-  version "2.2.0"
-  resolved "https://registry.yarnpkg.com/parse-json/-/parse-json-2.2.0.tgz#f480f40434ef80741f8469099f8dea18f55a4dc9"
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-
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-  version "0.0.0"
-  resolved "https://registry.yarnpkg.com/path-browserify/-/path-browserify-0.0.0.tgz#a0b870729aae214005b7d5032ec2cbbb0fb4451a"
-
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-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/path-exists/-/path-exists-2.1.0.tgz#0feb6c64f0fc518d9a754dd5efb62c7022761f4b"
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-    pinkie-promise "^2.0.0"
-
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-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/path-exists/-/path-exists-3.0.0.tgz#ce0ebeaa5f78cb18925ea7d810d7b59b010fd515"
-
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-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/path-is-absolute/-/path-is-absolute-1.0.1.tgz#174b9268735534ffbc7ace6bf53a5a9e1b5c5f5f"
-
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-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/path-key/-/path-key-2.0.1.tgz#411cadb574c5a140d3a4b1910d40d80cc9f40b40"
-
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-  version "1.0.5"
-  resolved "https://registry.yarnpkg.com/path-parse/-/path-parse-1.0.5.tgz#3c1adf871ea9cd6c9431b6ea2bd74a0ff055c4c1"
-
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-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/path-type/-/path-type-1.1.0.tgz#59c44f7ee491da704da415da5a4070ba4f8fe441"
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-    pify "^2.0.0"
-    pinkie-promise "^2.0.0"
-
-path-type@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/path-type/-/path-type-2.0.0.tgz#f012ccb8415b7096fc2daa1054c3d72389594c73"
-  dependencies:
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-
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-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/pathval/-/pathval-1.1.0.tgz#b942e6d4bde653005ef6b71361def8727d0645e0"
-
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-  version "3.0.14"
-  resolved "https://registry.yarnpkg.com/pbkdf2/-/pbkdf2-3.0.14.tgz#a35e13c64799b06ce15320f459c230e68e73bade"
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-    ripemd160 "^2.0.1"
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-
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-  version "0.10.0"
-  resolved "https://registry.yarnpkg.com/pegjs/-/pegjs-0.10.0.tgz#cf8bafae6eddff4b5a7efb185269eaaf4610ddbd"
-
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-  version "0.2.0"
-  resolved "https://registry.yarnpkg.com/performance-now/-/performance-now-0.2.0.tgz#33ef30c5c77d4ea21c5a53869d91b56d8f2555e5"
-
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-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/performance-now/-/performance-now-2.1.0.tgz#6309f4e0e5fa913ec1c69307ae364b4b377c9e7b"
-
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-  version "2.3.0"
-  resolved "https://registry.yarnpkg.com/pify/-/pify-2.3.0.tgz#ed141a6ac043a849ea588498e7dca8b15330e90c"
-
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-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/pinkie-promise/-/pinkie-promise-2.0.1.tgz#2135d6dfa7a358c069ac9b178776288228450ffa"
-  dependencies:
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-
-pinkie@^2.0.0:
-  version "2.0.4"
-  resolved "https://registry.yarnpkg.com/pinkie/-/pinkie-2.0.4.tgz#72556b80cfa0d48a974e80e77248e80ed4f7f870"
-
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-  version "2.3.0"
-  resolved "https://registry.yarnpkg.com/prebuild-install/-/prebuild-install-2.3.0.tgz#19481247df728b854ab57b187ce234211311b485"
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-    github-from-package "0.0.0"
-    minimist "^1.2.0"
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-    npmlog "^4.0.1"
-    os-homedir "^1.0.1"
-    pump "^1.0.1"
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-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"
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-  version "0.2.0"
-  resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
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-  version "0.1.8"
-  resolved "https://registry.yarnpkg.com/private/-/private-0.1.8.tgz#2381edb3689f7a53d653190060fcf822d2f368ff"
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-  version "1.0.7"
-  resolved "https://registry.yarnpkg.com/process-nextick-args/-/process-nextick-args-1.0.7.tgz#150e20b756590ad3f91093f25a4f2ad8bff30ba3"
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-  version "0.11.10"
-  resolved "https://registry.yarnpkg.com/process/-/process-0.11.10.tgz#7332300e840161bda3e69a1d1d91a7d4bc16f182"
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-  resolved "https://registry.yarnpkg.com/process/-/process-0.5.2.tgz#1638d8a8e34c2f440a91db95ab9aeb677fc185cf"
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-  version "0.0.0"
-  resolved "https://registry.yarnpkg.com/prr/-/prr-0.0.0.tgz#1a84b85908325501411853d0081ee3fa86e2926a"
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-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/prr/-/prr-1.0.1.tgz#d3fc114ba06995a45ec6893f484ceb1d78f5f476"
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-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/pseudomap/-/pseudomap-1.0.2.tgz#f052a28da70e618917ef0a8ac34c1ae5a68286b3"
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-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/public-encrypt/-/public-encrypt-4.0.0.tgz#39f699f3a46560dd5ebacbca693caf7c65c18cc6"
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-  version "6.4.0"
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-  resolved "https://registry.yarnpkg.com/require-main-filename/-/require-main-filename-1.0.1.tgz#97f717b69d48784f5f526a6c5aa8ffdda055a4d1"
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-  version "3.0.2"
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-wide-align@^1.1.0:
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/wide-align/-/wide-align-1.1.2.tgz#571e0f1b0604636ebc0dfc21b0339bbe31341710"
-  dependencies:
-    string-width "^1.0.2"
-
-window-size@0.1.0:
-  version "0.1.0"
-  resolved "https://registry.yarnpkg.com/window-size/-/window-size-0.1.0.tgz#5438cd2ea93b202efa3a19fe8887aee7c94f9c9d"
-
-window-size@^0.2.0:
-  version "0.2.0"
-  resolved "https://registry.yarnpkg.com/window-size/-/window-size-0.2.0.tgz#b4315bb4214a3d7058ebeee892e13fa24d98b075"
-
-wordwrap@0.0.2:
-  version "0.0.2"
-  resolved "https://registry.yarnpkg.com/wordwrap/-/wordwrap-0.0.2.tgz#b79669bb42ecb409f83d583cad52ca17eaa1643f"
-
-wordwrap@^1.0.0, wordwrap@~1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/wordwrap/-/wordwrap-1.0.0.tgz#27584810891456a4171c8d0226441ade90cbcaeb"
-
-wordwrap@~0.0.2:
-  version "0.0.3"
-  resolved "https://registry.yarnpkg.com/wordwrap/-/wordwrap-0.0.3.tgz#a3d5da6cd5c0bc0008d37234bbaf1bed63059107"
-
-wrap-ansi@^2.0.0:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/wrap-ansi/-/wrap-ansi-2.1.0.tgz#d8fc3d284dd05794fe84973caecdd1cf824fdd85"
-  dependencies:
-    string-width "^1.0.1"
-    strip-ansi "^3.0.1"
-
-wrappy@1:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/wrappy/-/wrappy-1.0.2.tgz#b5243d8f3ec1aa35f1364605bc0d1036e30ab69f"
-
-xhr2@*:
-  version "0.1.4"
-  resolved "https://registry.yarnpkg.com/xhr2/-/xhr2-0.1.4.tgz#7f87658847716db5026323812f818cadab387a5f"
-
-xhr@^2.2.0:
-  version "2.4.0"
-  resolved "https://registry.yarnpkg.com/xhr/-/xhr-2.4.0.tgz#e16e66a45f869861eeefab416d5eff722dc40993"
-  dependencies:
-    global "~4.3.0"
-    is-function "^1.0.1"
-    parse-headers "^2.0.0"
-    xtend "^4.0.0"
-
-xmlhttprequest@*:
-  version "1.8.0"
-  resolved "https://registry.yarnpkg.com/xmlhttprequest/-/xmlhttprequest-1.8.0.tgz#67fe075c5c24fef39f9d65f5f7b7fe75171968fc"
-
-xtend@4.0.1, xtend@^4.0.0, xtend@^4.0.1, xtend@~4.0.0:
-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.1.tgz#a5c6d532be656e23db820efb943a1f04998d63af"
-
-xtend@~2.1.1:
-  version "2.1.2"
-  resolved "https://registry.yarnpkg.com/xtend/-/xtend-2.1.2.tgz#6efecc2a4dad8e6962c4901b337ce7ba87b5d28b"
-  dependencies:
-    object-keys "~0.4.0"
-
-y18n@^3.2.1:
-  version "3.2.1"
-  resolved "https://registry.yarnpkg.com/y18n/-/y18n-3.2.1.tgz#6d15fba884c08679c0d77e88e7759e811e07fa41"
-
-yallist@^2.1.2:
-  version "2.1.2"
-  resolved "https://registry.yarnpkg.com/yallist/-/yallist-2.1.2.tgz#1c11f9218f076089a47dd512f93c6699a6a81d52"
-
-yargs-parser@^2.4.1:
-  version "2.4.1"
-  resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-2.4.1.tgz#85568de3cf150ff49fa51825f03a8c880ddcc5c4"
-  dependencies:
-    camelcase "^3.0.0"
-    lodash.assign "^4.0.6"
-
-yargs-parser@^7.0.0:
-  version "7.0.0"
-  resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-7.0.0.tgz#8d0ac42f16ea55debd332caf4c4038b3e3f5dfd9"
-  dependencies:
-    camelcase "^4.1.0"
-
-yargs@^4.6.0, yargs@^4.7.1:
-  version "4.8.1"
-  resolved "https://registry.yarnpkg.com/yargs/-/yargs-4.8.1.tgz#c0c42924ca4aaa6b0e6da1739dfb216439f9ddc0"
-  dependencies:
-    cliui "^3.2.0"
-    decamelize "^1.1.1"
-    get-caller-file "^1.0.1"
-    lodash.assign "^4.0.3"
-    os-locale "^1.4.0"
-    read-pkg-up "^1.0.1"
-    require-directory "^2.1.1"
-    require-main-filename "^1.0.1"
-    set-blocking "^2.0.0"
-    string-width "^1.0.1"
-    which-module "^1.0.0"
-    window-size "^0.2.0"
-    y18n "^3.2.1"
-    yargs-parser "^2.4.1"
-
-yargs@^8.0.2:
-  version "8.0.2"
-  resolved "https://registry.yarnpkg.com/yargs/-/yargs-8.0.2.tgz#6299a9055b1cefc969ff7e79c1d918dceb22c360"
-  dependencies:
-    camelcase "^4.1.0"
-    cliui "^3.2.0"
-    decamelize "^1.1.1"
-    get-caller-file "^1.0.1"
-    os-locale "^2.0.0"
-    read-pkg-up "^2.0.0"
-    require-directory "^2.1.1"
-    require-main-filename "^1.0.1"
-    set-blocking "^2.0.0"
-    string-width "^2.0.0"
-    which-module "^2.0.0"
-    y18n "^3.2.1"
-    yargs-parser "^7.0.0"
-
-yargs@~3.10.0:
-  version "3.10.0"
-  resolved "https://registry.yarnpkg.com/yargs/-/yargs-3.10.0.tgz#f7ee7bd857dd7c1d2d38c0e74efbd681d1431fd1"
-  dependencies:
-    camelcase "^1.0.2"
-    cliui "^2.1.0"
-    decamelize "^1.0.0"
-    window-size "0.1.0"