make py3 compat.
make py3 compat.

johnbolia/plyer,johnbolia/plyer,KeyWeeUsr/plyer,cleett/plyer,kived/plyer,kostyll/plyer,cleett/plyer,KeyWeeUsr/plyer,kivy/plyer,kivy/plyer,KeyWeeUsr/plyer,kivy/plyer,kostyll/plyer,kived/plyer