Added a note about GTK+ color selection dialog deprecations for later.
Added a note about GTK+ color selection dialog deprecations for later.

janstk/ui,cainiaocome/ui,mirrr/ui,robbiev/ui,beni55/ui,ProtonMail/ui,cainiaocome/ui,ProtonMail/ui,ProtonMail/ui,hajimehoshi/ui,janstk/ui,HunterChen/ui,hajimehoshi/ui,mirrr/ui,HunterChen/ui,mirrr/ui,robbiev/ui,beni55/ui,292388900/ui,janstk/ui,cainiaocome/ui,robbiev/ui,292388900/ui,beni55/ui,292388900/ui,HunterChen/ui,hajimehoshi/ui