fix: Modernize Django URL's (#93)
fix: Modernize Django URL's (#93)

Fixes this warning:

```
.../python3.9/site-packages/loginas/urls.py:6: RemovedInDjango40Warning: django.conf.urls.url() is deprecated in favor of django.urls.re_path().
    url(r"^logout/$", user_logout, name="loginas-logout"),
```

And uses the new path syntax added in Django 2.0
stochastic-technologies/django-loginas,skorokithakis/django-loginas,skorokithakis/django-loginas,stochastic-technologies/django-loginas