fix unicode issue for py3
fix unicode issue for py3

bitIO/powerline-shell,banga/powerline-shell,paulhybryant/powerline-shell,milkbikis/powerline-shell,b-ryan/powerline-shell,LeonardoGentile/powerline-shell,b-ryan/powerline-shell,Menci/powerline-shell,tswsl1989/powerline-shell,iKrishneel/powerline-shell,ceholden/powerline-shell,torbjornvatn/powerline-shell,paulhybryant/powerline-shell,banga/powerline-shell