Heroku Renomear
heroku apps:remane --app <old-project-name> <new-project-name>
Powerful Pheasant
heroku apps:remane --app <old-project-name> <new-project-name>First update the name for the heroku app on the heroku dashboard (on the heroku website)
Then do this on terminal (Make sure you're in the right repository)
$ git remote rm heroku (Remove the remote from git)
$ heroku git:remote -a <new app name> (Add it back with it's new name)$ git remote rm heroku
$ heroku git:remote -a newname
heroku apps:rename new_name --app old_name