Heroku clone a running up and update it with cli

Download the heroku cli and change the ssh keys if you have a previous installation of keys from some other account

 $heroku auth:logout

$heroku auth:login 

 Openweb page and authenticate with your creds, it will log you in.

download your code from a running app with 

heroku git:clone -a APP-NAME

Do a  git add .   // if you have changed a file

git commit -m "dfd"

git push heroku master.

You can see your updated app after the push is complete