add heroku usage to readme
add heroku usage to readme

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