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/Email.py

@@ -7,14 +7,10 @@ from django.contrib.auth import get_user_model
 from django.http import HttpResponseRedirect
 from django.shortcuts import render
 from django.template.context_processors import csrf
+from django.urls import reverse
 from django.utils import timezone
 from django.views.decorators.cache import never_cache
 
-try:
-    from django.core.urlresolvers import reverse
-except:
-    from django.urls import reverse
-
 from .Common import send
 from .models import User_Keys
 from .views import login