Update .travis.yml

Author: stain

.travis.yml

@@ -16,4 +16,7 @@ notifications:
       - https://webhooks.gitter.im/e/abea7d67d180d37286b3
     on_success: change  # options: [always|never|change] default: always
     on_failure: always  # options: [always|never|change] default: always
-    on_start: never     # options: [always|never|change] default: always
+    on_start: never     # options: [always|never|change] default: always
+    
+after_success:
+  - mvn clean cobertura:cobertura coveralls:report