Add support for django v4

fernet_fields/fields.py

@@ -2,9 +2,10 @@
 from django.conf import settings
 from django.core.exceptions import FieldError, ImproperlyConfigured
 from django.db import models
-from django.utils.encoding import force_bytes, force_text
+from django.utils.encoding import force_bytes
 from django.utils.functional import cached_property
 
+from .utils import force_text
 from . import hkdf
 
 

fernet_fields/test/test_fields.py

@@ -3,7 +3,12 @@
 
 from django.core.exceptions import FieldError, ImproperlyConfigured
 from django.db import connection, models as dj_models
-from django.utils.encoding import force_bytes, force_text
+from django.utils.encoding import force_bytes
+from django import VERSION as DJANGO_VERSION
+if DJANGO_VERSION[0] < 3:
+    from django.utils.encoding import force_text
+else:
+    from django.utils.encoding import force_str as force_text
 import pytest
 
 import fernet_fields as fields

fernet_fields/utils.py

@@ -0,0 +1,11 @@
+from django import VERSION as DJANGO_VERSION
+
+if DJANGO_VERSION[0] < 3:
+    from django.utils.encoding import force_text
+else:
+    from django.utils.encoding import force_str as force_text
+
+
+__all__ = [
+    "force_text"
+]