[Tests] also cache $HOME/.ghc for cabal

PeterDaveHello · PeterDaveHello · commit 7d08ad4311b7 · 2016-11-25T23:57:08.000+08:00
diff --git a/.travis.yml b/.travis.yml
@@ -13,6 +13,7 @@ addons:
       - ksh
 cache:
   directories:
+    - $HOME/.ghc
     - $HOME/.cabal
     - $TRAVIS_BUILD_DIR/.cache
 before_install:
