Fixed #290 -- Importing from django.core.urlresolvers is deprecated in favor of django.urls

CONTRIBUTING.md

@@ -95,7 +95,7 @@ Here is an example of these rules applied:
 
     # second set of imports are Django imports with contrib in their own
     # group.
-    from django.core.urlresolvers import reverse
+    from django.urls import reverse
     from django.db import models
     from django.utils import timezone
     from django.utils.translation import ugettext_lazy as _

pinax/stripe/middleware.py

@@ -1,7 +1,11 @@
 import django
-from django.core.urlresolvers import resolve
 from django.shortcuts import redirect
 
+try:
+    from django.urls import resolve
+except ImportError:
+    from django.core.urlresolvers import resolve
+
 from .actions import customers, subscriptions
 from .conf import settings
 

pinax/stripe/tests/test_admin.py

@@ -1,10 +1,14 @@
 import datetime
 
 from django.contrib.auth import get_user_model
-from django.core.urlresolvers import reverse
 from django.test import Client, TestCase
 from django.utils import timezone
 
+try:
+    from django.urls import reverse
+except ImportError:
+    from django.core.urlresolvers import reverse
+
 from ..models import Customer, Invoice, Plan, Subscription
 
 

pinax/stripe/tests/test_middleware.py

@@ -1,7 +1,11 @@
-from django.core.urlresolvers import reverse
 from django.test import TestCase
 from django.utils import timezone
 
+try:
+    from django.urls import reverse
+except ImportError:
+    from django.core.urlresolvers import reverse
+
 from django.contrib.auth import authenticate, login, logout, get_user_model
 
 from mock import Mock

pinax/stripe/tests/test_views.py

@@ -1,7 +1,11 @@
-from django.core.urlresolvers import reverse
 from django.test import TestCase
 from django.utils import timezone
 
+try:
+    from django.urls import reverse
+except ImportError:
+    from django.core.urlresolvers import reverse
+
 from django.contrib.auth import get_user_model
 
 import stripe

pinax/stripe/tests/test_webhooks.py

@@ -3,11 +3,15 @@
 
 import six
 
-from django.core.urlresolvers import reverse
 from django.dispatch import Signal
 from django.test import TestCase
 from django.test.client import Client
 
+try:
+    from django.urls import reverse
+except ImportError:
+    from django.core.urlresolvers import reverse
+
 import stripe
 
 from mock import patch