title: heroku: src refspec master does not match any
body: <p>I'm hosting on Heroku. When I push:</p>
  <pre><code>git push master Heroku
  </code></pre>
  <p>I get the error:</p>
  <pre><code>error: src refspec master does not match any.
  error: failed to push some refs to 'git@heroku.com: etc ...'
  </code></pre>