Change that fedmsg topic from "update" to "advance" (since it will al…

…ways be advancing, and we never emit messages for rank slipping).

tahrir_api/dbapi.py

@@ -617,7 +617,7 @@ def _adjust_ranks(self, person, old_rank):
 
         if self.notification_callback:
             self.notification_callback(
-                topic='person.rank.update',
+                topic='person.rank.advance',
                 msg=dict(
                     person=person,
                     old_rank=old_rank,