Update django reverse import

devel/models.py

 # -*- coding: utf-8 -*-
 import pytz
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.db import models
 from django.db.models.signals import pre_save
 from django.contrib.auth.models import User, Group

releng/models.py

@@ -5,7 +5,7 @@
 from pytz import utc
 
 from django.conf import settings
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.db import models
 from django.db.models.signals import pre_save
 from django.utils.safestring import mark_safe

releng/views.py

@@ -2,7 +2,7 @@
 import json
 
 from django.core.serializers.json import DjangoJSONEncoder
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.http import Http404, HttpResponse
 from django.shortcuts import get_object_or_404, render
 from django.views.generic import DetailView, ListView

sitemaps.py

@@ -2,7 +2,7 @@
 from pytz import utc
 
 from django.contrib.sitemaps import Sitemap
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 from main.models import Package
 from news.models import News