update readme for Heroku
update readme for Heroku

sodabrew/IMGKit,beni55/IMGKit,Ricardonacif/IMGKit,beni55/IMGKit,Ricardonacif/IMGKit,beni55/IMGKit,Ricardonacif/IMGKit,sodabrew/IMGKit,Ricardonacif/IMGKit,beni55/IMGKit