Also remove file hashes before caching

Author: blootsvoets

.travis.yml

@@ -5,7 +5,8 @@ env:
   TERM: dumb
 before_cache:
   - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
-  - rm -fr $HOME/.gradle/caches/*/plugin-resolution/
+  - rm -fr $HOME/.gradle/caches/*/plugin-resolution
+  - rm -fr $HOME/.gradle/caches/*/fileHashes
 cache:
   directories:
     - $HOME/.gradle/caches/