title: Error with 'Git push heroku master' command
body: <p>I am trying to update the code from my application to my repository and an error appears.</p>
  
  <p>How can I fix it?</p>
  
  <pre><code>C:\Sites\ecozap&gt;git push heroku master
  Enter passphrase for key '/c/Users/Diseño2/.ssh/id_rsa':
  Fetching repository, done.
  To git@heroku.com:ecozap.git
  ! [rejected]        master -&gt; master (non-fast-forward)
  error: failed to push some refs to 'git@heroku.com:ecozap.git'
  hint: Updates were rejected because the tip of your current branch is behind
  hint: its remote counterpart. Merge the remote changes (e.g. 'git pull')
  hint: before pushing again.
  hint: See the 'Note about fast-forwards' in 'git push --help' for details.
  </code></pre>