title: Django permissions not updating
body: <p>I have setup permissions in my model class as follows:</p>
  
  <pre><code>class MeetingHistory(models.Model):
  .....
  
      class Meta:
          permissions = (
              ("add_meeting_details","Can add meeting details"),
              ("change_meeting_details","Can change meeting details"),
      )
  </code></pre>
  
  <p>The <code>change_meeting_details</code> is a new permission I added however the django admin interface is not diplaying the new permission.</p>
  
  <p>I tried the following so far(based on other similar questions):
  - Run makemigrations app_name then ran migrate
  - refreshed the browser page and deleted all cache</p>
  
  <p>the issue still seems to persist. Any suggestions?</p>