Use https for webhooks
diff --git a/.travis.yml b/.travis.yml
index 05a6a66..de31504 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -110,4 +110,4 @@
 notifications:
   email:
     on_success: never
-  webhooks: http://buildbot.rust-lang.org/homu/travis
+  webhooks: https://buildbot.rust-lang.org/homu/travis