fix URL imports for 2.0

see also: #79, #81

robots/views.py

@@ -1,12 +1,17 @@
+import django
 from django.contrib.sitemaps import views as sitemap_views
 from django.contrib.sites.models import Site
-from django.core.urlresolvers import NoReverseMatch, reverse
 from django.views.decorators.cache import cache_page
 from django.views.generic import ListView
 
 from robots import settings
 from robots.models import Rule
 
+if django.VERSION[:2] >= (2, 0):
+    from django.urls import NoReverseMatch, reverse
+else:
+    from django.core.urlresolvers import NoReverseMatch, reverse
+
 
 class RuleList(ListView):
     """

tests/test_utils/urls.py

@@ -1,15 +1,21 @@
 # -*- coding: utf-8 -*-
 from __future__ import absolute_import, print_function, unicode_literals
 
+import django
+
 import django.contrib.sitemaps.views
 import django.views.i18n
 import django.views.static
 from django.conf import settings
-from django.conf.urls import include, url
 from django.contrib import admin
 from django.contrib.sitemaps.views import sitemap as sitemap_view
 from django.views.decorators.cache import cache_page
 
+if django.VERSION[:2] >= (2, 0):
+    from django.urls import include, re_path as url
+else:
+    from django.conf.urls import include, url
+
 urlpatterns = [
     url(r'^media/(?P<path>.*)$', django.views.static.serve,  # NOQA
         {'document_root': settings.MEDIA_ROOT, 'show_indexes': True}),