title: How to remove username field in the register form on django admin?
body: <p>using the rest-framework and the django-allauth settings flags for removing the username as required for both login and register:</p>
  
  <pre><code>#settings.py
  ACCOUNT_AUTHENTICATION_METHOD = 'email'
  ACCOUNT_EMAIL_REQUIRED = True
  ACCOUNT_UNIQUE_EMAIL = True
  ACCOUNT_USERNAME_REQUIRED = False
  </code></pre>
  
  <p>but i still see the username field in the registration form in the administrator and the username field in the user list (empty users those without username).</p>
  
  <p>how can i remove it?</p>