travis.yml: update go versions (#15154)

.travis.yml

@@ -6,7 +6,7 @@ matrix:
     - os: linux
       dist: trusty
       sudo: required
-      go: 1.7.6
+      go: 1.7.x
       script:
         - sudo -E apt-get -yq --no-install-suggests --no-install-recommends --force-yes install fuse
         - sudo modprobe fuse
@@ -18,7 +18,7 @@ matrix:
     - os: linux
       dist: trusty
       sudo: required
-      go: 1.8.3
+      go: 1.8.x
       script:
         - sudo -E apt-get -yq --no-install-suggests --no-install-recommends --force-yes install fuse
         - sudo modprobe fuse
@@ -31,7 +31,7 @@ matrix:
     - os: linux
       dist: trusty
       sudo: required
-      go: 1.9.0
+      go: 1.9.x
       script:
         - sudo -E apt-get -yq --no-install-suggests --no-install-recommends --force-yes install fuse
         - sudo modprobe fuse
@@ -41,7 +41,7 @@ matrix:
         - go run build/ci.go test -coverage -misspell
 
     - os: osx
-      go: 1.9.0
+      go: 1.9.x
       sudo: required
       script:
         - brew update
@@ -54,7 +54,7 @@ matrix:
     - os: linux
       dist: trusty
       sudo: required
-      go: 1.9.0
+      go: 1.9.x
       env:
         - ubuntu-ppa
         - azure-linux
@@ -93,7 +93,7 @@ matrix:
       sudo: required
       services:
         - docker
-      go: 1.9.0
+      go: 1.9.x
       env:
         - azure-linux-mips
       script:
@@ -150,7 +150,7 @@ matrix:
 
     # This builder does the OSX Azure, iOS CocoaPods and iOS Azure uploads
     - os: osx
-      go: 1.9.0
+      go: 1.9.x
       env:
         - azure-osx
         - azure-ios
@@ -176,7 +176,7 @@ matrix:
     - os: linux
       dist: trusty
       sudo: required
-      go: 1.9.0
+      go: 1.9.x
       env:
         - azure-purge
       script: