Add dialyxir to deps and ignore warnings from dependencies

mix.exs

@@ -12,7 +12,10 @@ defmodule ExW3.MixProject do
      description: description(),
      package: package(),
      name: "exw3",
-     source_url: "https://github.com/hswick/exw3"
+     source_url: "https://github.com/hswick/exw3",
+     dialyzer: [
+       remove_defaults: [:unknown]
+     ]
     ]
   end
 
@@ -37,6 +40,7 @@ defmodule ExW3.MixProject do
       {:ex_doc, ">= 0.0.0", only: :dev},
       {:ethereumex, "~> 0.4.0"},
       {:abi, "~> 0.1.8"},
+      {:dialyxir, "~> 1.0.0-rc.5", only: [:dev], runtime: false},
       {:poison, "~> 4.0.1"}
     ]
   end

mix.lock

@@ -2,7 +2,9 @@
   "abi": {:hex, :abi, "0.1.12", "87ae04cb09e2308db7b3c350584dc3934de0e308f6a056ba82be5756b081a1ca", [:mix], [{:exth_crypto, "~> 0.1.4", [hex: :exth_crypto, repo: "hexpm", optional: false]}], "hexpm"},
   "binary": {:hex, :binary, "0.0.5", "20d816f7274ea34f1b673b4cff2fdb9ebec9391a7a68c349070d515c66b1b2cf", [:mix], [], "hexpm"},
   "certifi": {:hex, :certifi, "2.4.2", "75424ff0f3baaccfd34b1214184b6ef616d89e420b258bb0a5ea7d7bc628f7f0", [:rebar3], [{:parse_trans, "~>3.3", [hex: :parse_trans, repo: "hexpm", optional: false]}], "hexpm"},
+  "dialyxir": {:hex, :dialyxir, "1.0.0-rc.6", "78e97d9c0ff1b5521dd68041193891aebebce52fc3b93463c0a6806874557d7d", [:mix], [{:erlex, "~> 0.2.1", [hex: :erlex, repo: "hexpm", optional: false]}], "hexpm"},
   "earmark": {:hex, :earmark, "1.2.6", "b6da42b3831458d3ecc57314dff3051b080b9b2be88c2e5aa41cd642a5b044ed", [:mix], [], "hexpm"},
+  "erlex": {:hex, :erlex, "0.2.1", "cee02918660807cbba9a7229cae9b42d1c6143b768c781fa6cee1eaf03ad860b", [:mix], [], "hexpm"},
   "ethereumex": {:hex, :ethereumex, "0.4.0", "6ed98639c717dc7940a56f657fb81f44afe3e0287f9825b7b0f9016642e605ac", [:mix], [{:httpoison, "~> 1.3.1", [hex: :httpoison, repo: "hexpm", optional: false]}, {:poison, "~> 4.0.1", [hex: :poison, repo: "hexpm", optional: false]}], "hexpm"},
   "ex_doc": {:hex, :ex_doc, "0.19.1", "519bb9c19526ca51d326c060cb1778d4a9056b190086a8c6c115828eaccea6cf", [:mix], [{:earmark, "~> 1.1", [hex: :earmark, repo: "hexpm", optional: false]}, {:makeup_elixir, "~> 0.7", [hex: :makeup_elixir, repo: "hexpm", optional: false]}], "hexpm"},
   "exth_crypto": {:hex, :exth_crypto, "0.1.6", "8e636a9bcb75d8e32451be96e547a495121ed2178d078db294edb0f81f7cf2e8", [:mix], [{:binary, "~> 0.0.4", [hex: :binary, repo: "hexpm", optional: false]}, {:keccakf1600, "~> 2.0.0", [hex: :keccakf1600_orig, repo: "hexpm", optional: false]}, {:libsecp256k1, "~> 0.1.9", [hex: :libsecp256k1, repo: "hexpm", optional: false]}], "hexpm"},