Scheduling new meeting time for Messaging SIG

[Ralph Bean]

The Messaging SIG has been meeting on Tuesdays at 16.00 UTC.  Turnout
has been a little low and we concluded that it's not the best time.

If you're interested in participating in meetings, please fill out the
following survey so I can get a good idea of when to place them:

  http://whenisgood.net/fedmsg

For the curious, here's a list of the archived meeting logs:

 https://github.com/ralphbean/fedmsg/blob/develop/doc/meetings.rst

-threebean