[deps] Add Support for django 3.2 and 4.0a1 openwisp#122

Added django version 3.2 and 4.0a1
, removed 2.2.0, updated some changes
that were required.

Fixes openwisp#122

.github/workflows/ci.yml

@@ -21,9 +21,13 @@ jobs:
           - 3.8
           - 3.9
         django-version:
-          - django~=2.2.0
           - django~=3.0.0
           - django~=3.1.0
+          - django~=3.2.0
+        include:
+          - django-version: django~=4.0a1
+            python-version: 3.8
+            experimental: true
 
     steps:
     - uses: actions/checkout@v2

django_x509/apps.py

@@ -1,5 +1,5 @@
 from django.apps import AppConfig
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 
 
 class DjangoX509Config(AppConfig):

django_x509/base/admin.py

@@ -5,8 +5,8 @@
 from django.shortcuts import get_object_or_404, render
 from django.urls import reverse
 from django.utils.html import format_html
+from django.utils.translation import gettext_lazy as _
 from django.utils.translation import ngettext
-from django.utils.translation import ugettext_lazy as _
 
 from django_x509 import settings as app_settings
 

django_x509/base/models.py

@@ -9,7 +9,7 @@
 from django.utils import timezone
 from django.utils.functional import cached_property
 from django.utils.safestring import mark_safe
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 from jsonfield import JSONField
 from model_utils.fields import AutoCreatedField, AutoLastModifiedField
 from OpenSSL import crypto

requirements.txt

@@ -1,4 +1,4 @@
-django>=2.2.0,<3.2.0
+django>=3.0.0,<=4.0a1
 openwisp-utils~=0.7.2
 jsonfield>=3.1.0,<4.0.0
 cryptography~=3.4