add heroku to git code example

Example 1: git push to heroku

$ git push heroku master

Example 2: deploying to heroku from git

$ heroku git:remote -a thawing-inlet-61413
set git remote heroku to https://git.heroku.com/thawing-inlet-61413.git

Example 3: deploying to heroku from git

$ git push heroku testbranch:master