rm urlresolvers compat

has been removed in django 2.0

https://docs.djangoproject.com/en/1.10/internals/deprecation/#deprecation-removed-in-2-0

mfa/views.py

@@ -4,13 +4,9 @@ from django.conf import settings
 from django.contrib.auth.decorators import login_required
 from django.http import HttpResponse, HttpResponseRedirect
 from django.shortcuts import render
+from django.urls import reverse
 from user_agents import parse
 
-try:
-    from django.urls import reverse
-except:
-    from django.core.urlresolvers import reverse
-
 from . import TrustedDevice
 from .models import User_Keys