also fix sphinx version in travis
also fix sphinx version in travis

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