Django upgrade

users/apps.py

@@ -0,0 +1,19 @@
+# -*- mode: python; coding: utf-8 -*-
+# Copyright (C) 2017-2019 by BDE ENS Paris-Saclay
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from django.apps import AppConfig
+from django.conf import settings
+from django.db.models.signals import post_save
+from django.utils.translation import ugettext_lazy as _
+
+from .signals import add_to_default_group
+
+
+class UsersConfig(AppConfig):
+    name = 'users'
+    verbose_name = _('users')
+
+    def ready(self):
+        post_save.connect(add_to_default_group,
+                          sender=settings.AUTH_USER_MODEL)