update the CompoundSelectionBehavior example
update the CompoundSelectionBehavior example

With the original example code, keyboard select fails, because for some reason self._update_counts is never called. This fixes the problem. (Using the python3 version of super() would also fix the problem, but obviously that's not a good idea because of backwards compatibility.)
jkankiewicz/kivy,Cheaterman/kivy,darkopevec/kivy,rnixx/kivy,bionoid/kivy,LogicalDash/kivy,inclement/kivy,bionoid/kivy,manthansharma/kivy,autosportlabs/kivy,akshayaurora/kivy,autosportlabs/kivy,bionoid/kivy,jegger/kivy,KeyWeeUsr/kivy,LogicalDash/kivy,rnixx/kivy,darkopevec/kivy,manthansharma/kivy,matham/kivy,LogicalDash/kivy,bionoid/kivy,darkopevec/kivy,aron-bordin/kivy,tony/kivy,jegger/kivy,jkankiewicz/kivy,akshayaurora/kivy,aron-bordin/kivy,janssen/kivy,KeyWeeUsr/kivy,manthansharma/kivy,aron-bordin/kivy,jkankiewicz/kivy,autosportlabs/kivy,rafalo1333/kivy,inclement/kivy,kivy/kivy,Cheaterman/kivy,LogicalDash/kivy,Cheaterman/kivy,akshayaurora/kivy,tony/kivy,kivy/kivy,darkopevec/kivy,janssen/kivy,jegger/kivy,tony/kivy,matham/kivy,rnixx/kivy,janssen/kivy,kived/kivy,matham/kivy,jkankiewicz/kivy,aron-bordin/kivy,KeyWeeUsr/kivy,KeyWeeUsr/kivy,matham/kivy,kived/kivy,janssen/kivy,rafalo1333/kivy,inclement/kivy,kivy/kivy,jegger/kivy,manthansharma/kivy,rafalo1333/kivy,kived/kivy,Cheaterman/kivy