fix pango_demo.py for python2
fix pango_demo.py for python2

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