Call the webhook only on change/change

.travis.yml

@@ -15,9 +15,8 @@ notifications:
     webhooks:
         urls:
 	    - https://webhooks.gitter.im/e/66485d8f591942052faa
-	on_success: always  # options: [always|never|change] default: always
-	on_failure: always  # options: [always|never|change] default: always
-	on_start: false     # default: false
+	on_success: change
+	on_failure: change
 matrix:
     fast_finish: true
     allow_failures: