Run Dialyzer in CI

.gitignore

@@ -16,6 +16,10 @@ erl_crash.dump
 # Also ignore archive artifacts (built via "mix archive.build").
 *.ez
 
+# Dialyzer
+/priv/plts/*.plt
+/priv/plts/*.plt.hash
+
 /src/*_lexer.erl
 /src/*_parser.erl
 

.travis.yml

@@ -21,3 +21,7 @@ after_script:
   - MIX_ENV=docs mix inch.report
 script:
   - MIX_ENV=test mix coveralls.travis
+  - mix dialyzer
+cache:
+  directories:
+    - priv/plts

mix.exs

@@ -80,11 +80,9 @@ defmodule RDF.Mixfile do
   end
 
   defp dialyzer do
-    # Dialyzer will emit a warning when the name of the plt file is set
-    # as people misused it in the past. Without setting a name caching of
-    # this file is much more trickier, so we still use this functionality.
     [
       plt_add_apps: [:mix],
+      plt_file: {:no_warn, "priv/plts/dialyzer.plt"},
       ignore_warnings: ".dialyzer_ignore"
     ]
   end