Django Upgrade to 2.2 - changes

subui/step.py

@@ -5,7 +5,7 @@
 from collections import OrderedDict
 
 import six
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.test import override_settings
 
 from .validators import BaseValidator

subui/validators.py

@@ -2,7 +2,7 @@
 import inspect
 
 from django.core.exceptions import ImproperlyConfigured
-from django.core.urlresolvers import Resolver404, resolve
+from django.urls import Resolver404, resolve
 from django.template.response import SimpleTemplateResponse
 from six.moves.urllib_parse import urlsplit, urlunsplit
 

tests/test_validators.py

@@ -3,7 +3,7 @@
 
 import mock
 from django.core.exceptions import ImproperlyConfigured
-from django.core.urlresolvers import Resolver404
+from django.urls import Resolver404
 from django.http.response import HttpResponse
 from django.template.response import SimpleTemplateResponse