Compatibility with Django 2.0

[cnsimbe]

Added on_delete to ForeignKey in models
Changed from django.urls.urlresolvers import reverse" to from "from django.urls import reverse"

[samuira]

Still getting this error.
user = models.OneToOneField(get_user_model_setting())
TypeError: init() missing 1 required positional argument: 'on_delete'

[cnsimbe]

@samuira add the position argument on_delete https://docs.djangoproject.com/en/2.2/ref/models/fields/#django.db.models.OneToOneField