Add ~/.gradle to travis build-caches
Add ~/.gradle to travis build-caches

benjamin-bader/dexcount-gradle-plugin,benjamin-bader/dexcount-gradle-plugin,KeepSafe/dexcount-gradle-plugin,MaTriXy/dexcount-gradle-plugin,benjamin-bader/dexcount-gradle-plugin,MaTriXy/dexcount-gradle-plugin,KeepSafe/dexcount-gradle-plugin,MaTriXy/dexcount-gradle-plugin,MaTriXy/dexcount-gradle-plugin,KeepSafe/dexcount-gradle-plugin,MaTriXy/dexcount-gradle-plugin