bionic not available on travis, so use a ppa that have latest sdl2
bionic not available on travis, so use a ppa that have latest sdl2

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