When I log in with Auth0, the response contains a sub parameter instead of the expected user_id parameter shown in Auth0ResourceOwner. Am I using Auth0 incorrectly, or has something changed recently (due to the purchase by Okta?)

    public function getId()
    {
        return $this->getValueByKey($this->response, 'user_id');
    }

I could probably work around that by tweaking this method to check for user_id, then sub if user_id isn't found. If that's an acceptable solution I can raise a PR.