old_contents: from django.apps import AppConfig
  
  
  class DjangoSESConfig(AppConfig):
      name = 'django_ses'
      verbose_name = 'Django SES'
  
new_contents: from django.apps import AppConfig
  
  
  class DjangoSESConfig(AppConfig):
      name = 'django_ses'
      verbose_name = 'Django SES'
  
      default_auto_field = 'django.db.models.AutoField'
  
subject: Add default_auto_field to apps.py (#231)