Update .travis.yml

.travis.yml

@@ -49,5 +49,10 @@ deploy:
   on:
     tags: Yakindu/statecharts
     condition: "$TRAVIS_TAG =~ ^release.*$"
-after_success:
-  - bash <(curl -s https://codecov.io/bash)   
+notifications:
+  webhooks:
+    urls:
+      - https://webhooks.gitter.im/e/7b7c5ba24ab36f09d721
+    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