Expose Capabilities.get_channel_classes() to g-i.
Expose Capabilities.get_channel_classes() to g-i.

Reviewed-by: Simon McVittie <2b470b34502dbf3ba4bcc04ea7e64f4e0e104f33@collabora.co.uk>
Acked-by: Danielle Madeley <cd3388d942c192eec69203167a58e9c0f68f04d8@collabora.co.uk>

Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib