rename function in exit_code segment to match filename
rename function in exit_code segment to match filename

paol/powerline-shell,JulianVolodia/powerline-shell,iKrishneel/powerline-shell,junix/powerline-shell,LeonardoGentile/powerline-shell,rbanffy/powerline-shell,b-ryan/powerline-shell,b-ryan/powerline-shell,banga/powerline-shell,milkbikis/powerline-shell,bitIO/powerline-shell,MartinWetterwald/powerline-shell,banga/powerline-shell,Menci/powerline-shell,mart-e/powerline-shell,mcdope/powerline-shell,paulhybryant/powerline-shell,ceholden/powerline-shell,nicholascapo/powerline-shell,paulhybryant/powerline-shell,dtrip/powerline-shell,torbjornvatn/powerline-shell,handsomecheung/powerline-shell,intfrr/powerline-shell,tswsl1989/powerline-shell