Merge 0.2.6 Django 2.0 updates

helpdesk/decorators.py

@@ -1,6 +1,6 @@
 from functools import wraps
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.http import HttpResponseRedirect, Http404
 from django.utils.decorators import available_attrs
 from django.contrib.auth.decorators import user_passes_test