title: Avoid merge remote-tracking branch 'origin/master' on single-user git repositories
body: <p>I know there are several questions concerning multiple merge remote-tracking
  branch <code>origin/master</code> commits, albeit they all seem to address cases where
  multiple users are using a Git repository. However, in my case I’m using the
  repository alone, and still have those merge commits on almost every push. See
  the screenshot for an example. These commits were commited and pushed
  consecutively from the same machine by the same user.</p>
  
  <blockquote>
    <p><img src="https://i.stack.imgur.com/pX9gl.png" alt="DAG"></p>
  </blockquote>
  
  <p>How can I stop these unnecessary merge events?</p>