new client icon plugin require gtk3 branch of Gajim

clients_icons/manifest.ini

@@ -5,6 +5,7 @@ version: 4.0
 description: Shows the client icons in the roster
  and in groupchats.
  For icons in tooltip support, you need to install Gajim r14117 or above.
-authors = Denis Fomin <fominde@gmail.com>
+authors: Denis Fomin <fominde@gmail.com>
  Artem Klyop <art.klyop@gmail.com>
-homepage = http://trac-plugins.gajim.org/wiki/ClientsIconsPlugin
+homepage: http://trac-plugins.gajim.org/wiki/ClientsIconsPlugin
+min_gajim_version: 0.15.10.0