title: Can't push on heroku
body: <p>I’ve just cloned one of my repositories on github, I've made some changes and I would like to send it on the heroku application. But when I try to run <code>git push heroku master</code>, I get :</p>
  
  <pre><code>fatal: 'heroku' does not appear to be a git repository
  fatal: Could not read from remote repository.
  
  Please make sure you have the correct access rights
  and the repository exists.
  </code></pre>
  
  <p>What can I do to solve it?</p>