Run Dialyzer in CI

.gitignore

@@ -16,4 +16,8 @@ erl_crash.dump
 # Also ignore archive artifacts (built via "mix archive.build").
 *.ez
 
+# Dialyzer
+/priv/plts/*.plt
+/priv/plts/*.plt.hash
+
 .tool-versions*

.travis.yml

@@ -22,3 +22,7 @@ matrix:
 sudo: false
 script:
   - MIX_ENV=test mix coveralls.travis
+  - mix dialyzer
+cache:
+  directories:
+    - priv/plts

mix.exs

@@ -28,6 +28,9 @@ defmodule JSON.LD.Mixfile do
         extras: ["README.md"]
       ],
 
+      # Dialyzer
+      dialyzer: dialyzer(),
+
       # ExCoveralls
       test_coverage: [tool: ExCoveralls],
       preferred_cli_env: [
@@ -72,6 +75,12 @@ defmodule JSON.LD.Mixfile do
     ]
   end
 
+  defp dialyzer do
+    [
+      plt_file: {:no_warn, "priv/plts/dialyzer.plt"}
+    ]
+  end
+
   defp elixirc_paths(:test), do: ["lib", "test/support"]
   defp elixirc_paths(_), do: ["lib"]
 end