change heroku remote code example

Example 1: how to add existing heroku remote

git remote add heroku [email protected]:project.git

Example 2: rename heroku app

$ heroku apps:rename newname
Renaming oldname to newname... done
http://newname.herokuapp.com/ | [email protected]:newname.git
Git remote heroku updated

Example 3: heroku rename

heroku apps:remane --app  

Example 4: push heroku

$ git push heroku master