Add more directories to Travis cache

Porges · Porges · commit 5764b173516f · 2017-11-06T21:09:16.000+11:00
diff --git a/.travis.yml b/.travis.yml
@@ -37,3 +37,5 @@ script: stack $ARGS --no-terminal --install-ghc test --haddock
 cache:
   directories:
   - $HOME/.stack
+  - $HOME/.ghc
+  - $HOME/.cabal
