CI: Make IRC notifications for travis less verbose

.travis.yml

@@ -19,3 +19,8 @@ notifications:
   irc:
     channels:
       - "chat.freenode.net#icecast-mentors"
+    on_success: change
+    on_failure: always
+    template:
+      - "%{repository_slug}#%{build_number} (%{branch} - %{commit} : %{author}): %{message}"
+      - "Build details : %{build_url}"