fix(django): Set default_auto_field to 'AutoField'

This will avoid warnings in Django 3.2 and will avoid the creation of
new migrations.

ChangeLog.rst

@@ -16,6 +16,11 @@ Backwards incompatible changes
   been renamed to ``certificate_key``. This is done to prevent the key from being displayed
   without being masked in Django debug pages.
 
+0.44.0
+******
+
+- Better compatibility with Django 3.2
+
 
 0.43.0 (2020-10-15)
 *******************

allauth/account/apps.py

@@ -5,3 +5,4 @@
 class AccountConfig(AppConfig):
     name = "allauth.account"
     verbose_name = _("Accounts")
+    default_auto_field = 'django.db.models.AutoField'

allauth/socialaccount/apps.py

@@ -5,3 +5,4 @@
 class SocialAccountConfig(AppConfig):
     name = "allauth.socialaccount"
     verbose_name = _("Social Accounts")
+    default_auto_field = 'django.db.models.AutoField'

example/example/demo/apps.py

@@ -37,6 +37,7 @@ def setup_dummy_social_apps(sender, **kwargs):
 class DemoConfig(AppConfig):
     name = 'example.demo'
     verbose_name = _('Demo')
+    default_auto_field = 'django.db.models.AutoField'
 
     def ready(self):
         post_migrate.connect(setup_dummy_social_apps, sender=self)