Corrected import of reverse() for Django 2.0

netbox/extras/models.py

@@ -9,7 +9,7 @@ from django.contrib.auth.models import User
 from django.contrib.contenttypes.fields import GenericForeignKey
 from django.contrib.contenttypes.models import ContentType
 from django.contrib.postgres.fields import JSONField
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.core.validators import ValidationError
 from django.db import models
 from django.db.models import Q