caching m2

.travis.yml

   - master
   - v2
 
-before_cache:
-  - rm -rf $HOME/.gradle/caches/modules-2/modules-2.lock
-  - rm -rf $HOME/.gradle/caches/*/plugin-resolution/
-
 cache:
   yarn: true
   directories:
     - node_modules
     - $HOME/.gradle/caches/
     - $HOME/.gradle/wrapper/
+    - $HOME/.m2
+
+before_cache:
+  - rm -rf $HOME/.gradle/caches/modules-2/modules-2.lock
+  - rm -rf $HOME/.gradle/caches/*/plugin-resolution/
 
 before_install:
   - set -e