Replaced convos avatar with http://robohash.org/convos.by

  http://robohash.org/
  Robohash is a easy web service that makes it easy to provide unique,
  robot/alien/monster/whatever images for any text.

  Robohash contains robots created by Zikri Kader (set1), Hrvoje
  Novakovic (set2), and Julian Peter Arias (set3).
  You are free to embed under the terms of the CC-BY license.
  Example wording might be "Robots lovingly delivered by Robohash.org"
  or something.