title: Call custom function when Django rest-auth/register succeeds
body: <p>Is there an easy way to tap into a successful call to the Django REST Framework /rest-auth/register API call (Django-rest-auth) so that a custom function can be called when a user has been successfully registered? The custom function I have written sends a push notification to my phone every time a user signs up.</p>
  
  <p>Obviously I can edit the rest-auth code plugin but this edit would not last if I update the plugin to a newer version.</p>