title: Custom User model fields (AbstractUser) not showing in django admin
body: <p>I have extended User model for django, using AbstractUser method. The problem is, my custom fields do not show in django admin panel.</p>
  
  <p>My models.py:</p>
  
  <pre><code>from django.contrib.auth.models import AbstractUser
  
  
  class User(AbstractUser):
      is_bot_flag = models.BooleanField(default=False)
  </code></pre>
  
  <p>My admin.py:</p>
  
  <pre><code>from django.contrib.auth.admin import UserAdmin
  from .models import User
  
  admin.site.register(User, UserAdmin)
  </code></pre>
  
  <p>Thanks</p>