removed the changes which were not required

Author: raybittuiq

nested_admin/formsets.py

@@ -12,7 +12,7 @@
 from six.moves import range
 
 if six.PY2:
-    from django.utils.encoding import force_str as force_str
+    from django.utils.encoding import force_text as force_str
 else:
     from django.utils.encoding import force_str
 

nested_admin/nested.py

@@ -9,7 +9,7 @@
     from django.urls import reverse
 except ImportError:
     # Django <= 1.9
-    from django.urls import reverse
+    from django.core.urlresolvers import reverse
 from django.template.defaultfilters import capfirst
 import six
 from django.utils.functional import lazy

nested_admin/tests/two_deep/test_permissions.py

@@ -9,7 +9,7 @@
 try:
     from django.urls import reverse
 except ImportError:
-    from django.urls import reverse
+    from django.core.urlresolvers import reverse
 
 from nested_admin.tests.base import BaseNestedAdminTestCase
 from .models import StackedGroup, StackedSection, StackedItem

nested_admin/views.py

@@ -7,7 +7,7 @@
     from django.urls import reverse, NoReverseMatch
 except ImportError:
     # Django <= 1.9
-    from django.urls import NoReverseMatch, reverse
+    from django.core.urlresolvers import reverse, NoReverseMatch
 from django.http import HttpResponse, HttpResponseForbidden