Add Travis webhook

.travis.yml

@@ -35,6 +35,8 @@ before_install:
 script: pwsh -NonInteractive -NoProfile -NoLogo scripts/ci.ps1
 
 notifications:
+  webhooks:
+    urls: [https://webhooks.gitter.im/e/064f3494f67de1248aa0]
   email:
     on_success: change
     on_failure: always