ci: travis: tweak the IRC notification message template to our needs

I wanted to have the commit subject in it. This could be further changed
if needed.

https://docs.travis-ci.com/user/notifications/#Configuring-IRC-notifications

.travis.yml

@@ -75,3 +75,8 @@ notifications:
       - "chat.freenode.net#edevelop"
     on_success: change
     on_failure: always
+    template:
+      - "TravisCI build %{build_number} in branch %{branch}: %{result} - %{message}"
+      - "Commit: %{commit_subject} (%{commit}) from %{author}"
+      - "Change view : %{compare_url}"
+      - "Build details : %{build_url}"