Update Travis CI cache dirs

Author: japgolly

.travis.yml

@@ -28,8 +28,7 @@ before_cache:
   - find $HOME/.ivy2/cache -name "ivydata-*.properties" -type f -delete
 cache:
   directories:
-    - $HOME/.sbt/0.13/dependency
-    - $HOME/.sbt/boot/scala*
-    - $HOME/.sbt/launchers
+    - $HOME/.coursier
     - $HOME/.ivy2/cache
+    - $HOME/.sbt