add missing versionadded to pagelayout's anim_kwargs
add missing versionadded to pagelayout's anim_kwargs

LogicalDash/kivy,LogicalDash/kivy,matham/kivy,LogicalDash/kivy,akshayaurora/kivy,kivy/kivy,inclement/kivy,matham/kivy,akshayaurora/kivy,rnixx/kivy,matham/kivy,kivy/kivy,LogicalDash/kivy,inclement/kivy,matham/kivy,inclement/kivy,rnixx/kivy,kivy/kivy,rnixx/kivy,akshayaurora/kivy