rgba: add missing versionadded and expose it into the __all__
rgba: add missing versionadded and expose it into the __all__

cbenhagen/kivy,el-ethan/kivy,jkankiewicz/kivy,CuriousLearner/kivy,LogicalDash/kivy,el-ethan/kivy,janssen/kivy,manthansharma/kivy,inclement/kivy,matham/kivy,autosportlabs/kivy,bionoid/kivy,manthansharma/kivy,jegger/kivy,KeyWeeUsr/kivy,Cheaterman/kivy,aron-bordin/kivy,matham/kivy,akshayaurora/kivy,jegger/kivy,jkankiewicz/kivy,KeyWeeUsr/kivy,kivy/kivy,cbenhagen/kivy,aron-bordin/kivy,darkopevec/kivy,arlowhite/kivy,bionoid/kivy,kivy/kivy,rafalo1333/kivy,aron-bordin/kivy,rafalo1333/kivy,janssen/kivy,Cheaterman/kivy,andnovar/kivy,cbenhagen/kivy,LogicalDash/kivy,autosportlabs/kivy,jkankiewicz/kivy,jegger/kivy,andnovar/kivy,kivy/kivy,matham/kivy,el-ethan/kivy,rnixx/kivy,CuriousLearner/kivy,CuriousLearner/kivy,inclement/kivy,akshayaurora/kivy,rnixx/kivy,akshayaurora/kivy,Cheaterman/kivy,rafalo1333/kivy,LogicalDash/kivy,tony/kivy,manthansharma/kivy,matham/kivy,KeyWeeUsr/kivy,arlowhite/kivy,darkopevec/kivy,inclement/kivy,jegger/kivy,rnixx/kivy,tony/kivy,tony/kivy,darkopevec/kivy,bionoid/kivy,andnovar/kivy,Cheaterman/kivy,janssen/kivy,kived/kivy,jkankiewicz/kivy,aron-bordin/kivy,janssen/kivy,LogicalDash/kivy,KeyWeeUsr/kivy,autosportlabs/kivy,manthansharma/kivy,arlowhite/kivy,bionoid/kivy,kived/kivy,darkopevec/kivy,kived/kivy