title: code push to heroku not working
body: <p>I want to push code on heroku that is on gihub </p>
  
  <p>I used the following command</p>
  
  <pre><code>git push heroku mybranch:master
  </code></pre>
  
  <p>The error is </p>
  
  <pre><code>To https://github.com/user/lyricle-new.git
   ! [rejected]        lyricle-frt-backend -&gt; master (non-fast-forward)
  error: failed to push some refs to 'https://github.com/user/app.git'
  hint: Updates were rejected because a pushed branch tip is behind its remote
  hint: counterpart. Check out this branch and merge the remote changes
  hint: (e.g. 'git pull') before pushing again.
  hint: See the 'Note about fast-forwards' in 'git push --help' for details.
  </code></pre>
  
  <p>Used the command <code>git pull</code> as mentioned in hint the response was <code>Already up-to-date.</code></p>
  
  <p>What could be the reasons behind this error? and is this the correct way to push on heroku </p>