Use the right module name for the json module.

 - Legacy-Id: 3507

Author: levkowetz

ietf/ietfauth/views.py

@@ -160,5 +160,5 @@ def ajax_check_username(request):
     error = False
     if User.objects.filter(username=username).count():
         error = _('This email is already in use')
-    return HttpResponse(simplejson.dumps({'error': error}), mimetype='text/plain')
+    return HttpResponse(json.dumps({'error': error}), mimetype='text/plain')