Fix travis integration with gitter

Author: m-kuhn

.travis.yml

@@ -14,7 +14,7 @@ notifications:
 notifications:
   webhooks:
     urls:
-      - https://webhooks.gitter.im/e/5d0244ab020a75bf7d17
+      - https://webhooks.gitter.im/e/467e3aff72e344d1dae3
     on_success: change  # options: [always|never|change] default: always
     on_failure: change # options: [always|never|change] default: always
     on_start: never # default: never