title: squashmigrations useage (how to find 'migration_name')
body: <p>I'm using Django 1.8.</p>
  
  <p>When running <code>python manage.py squashmigrations myapp</code> I get this:</p>
  
  <pre><code>manage.py squashmigrations: error: the following arguments are required: migration_name
  </code></pre>
  
  <p>How do I find the <strong>migration_name</strong>?</p>