Send message on check failure

Change-Id: I26065e38d0b71e753c518f055c778282a6a6f5e9
diff --git a/zuul.d/pipelines.yaml b/zuul.d/pipelines.yaml
index 84a32af..c0aeaa7 100644
--- a/zuul.d/pipelines.yaml
+++ b/zuul.d/pipelines.yaml
@@ -48,7 +48,7 @@
           message: 'Change passed all voting jobs'
     failure:
       gerrit:
-        comment: False
+        comment: True
         Verified: -1
         checks-api:
           scheme: 'zuul-check'