Merge branch '6.4' into 7.0

* 6.4:
  [Messenger] Add mention of workers restarting with `supervisor`

Author: OskarStark

messenger.rst

@@ -743,6 +743,10 @@ Next, tell Supervisor to read your config and start your workers:
 
     $ sudo supervisorctl start messenger-consume:*
 
+    # If you deploy an update of your code, don't forget to restart your workers
+    # to run the new code
+    $ sudo supervisorctl restart messenger-consume:*
+
 See the `Supervisor docs`_ for more details.
 
 Graceful Shutdown