Used isort to order all import statements

src/pretix/urls.py

@@ -1,12 +1,12 @@
 import importlib
+
 from django.apps import apps
-from django.conf.urls import include, url
 from django.conf import settings
+from django.conf.urls import include, url
 
 import pretix.control.urls
 import pretix.presale.urls
 
-
 urlpatterns = [
     url(r'^control/', include(pretix.control.urls, namespace='control')),
     # The pretixpresale namespace is configured at the bottom of this file, because it