[clients_icons] Update manifest.ini

clients_icons/manifest.ini

 [info]
 name: Clients icons
 short_name: clients_icons
-version: 4.7
-description: Shows the client icons in the roster
- and in groupchats.
- For icons in tooltip support, you need to install Gajim r14117 or above.
+version: 6.0
+description: Shows client icons in roster and in groupchats.
 authors: Denis Fomin <fominde@gmail.com>
  Artem Klyop <art.klyop@gmail.com>
-homepage: http://trac-plugins.gajim.org/wiki/ClientsIconsPlugin
+homepage: https://dev.gajim.org/gajim/gajim-plugins/wikis/ClientsIconsPlugin
 min_gajim_version: 0.16.11