Stop posting notifications to our defunct gitter channel

All the chatter's happening on Slack these days.

Author: bbatsov

.travis.yml

@@ -68,11 +68,3 @@ jobs:
     - env: VERSION=master TARGET=test-clj
     - env: VERSION=master TARGET=test-cljs
     - env: VERSION=1.9 TARGET=cloverage
-
-notifications:
-  webhooks:
-    urls:
-      - https://webhooks.gitter.im/e/14f0f7b4d5b20a70d032
-    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