Add notifications/webhooks to .travis.yml

.travis.yml

@@ -10,3 +10,11 @@ script:
   - go get github.com/mattn/goveralls
   - go test -v -covermode=count -coverprofile=coverage.out
   - goveralls -coverprofile=coverage.out -service=travis-ci -repotoken yFj7FrCeddvBzUaaCyG33jCLfWXeb93eA
+
+notifications:
+  webhooks:
+    urls:
+      - https://webhooks.gitter.im/e/acc2c57482e94b44f557
+    on_success: change  # options: [always|never|change] default: always
+    on_failure: always  # options: [always|never|change] default: always
+    on_start: false     # default: false