Django 4.0 compitability

[miklagard]

in views.py there is:

from django.utils.http import is_safe_url

ImportError: cannot import name 'is_safe_url' from 'django.utils.http'

is_safe_url is outdates in django 4.0. it should be something like:
from django.utils.http import url_has_allowed_host_and_scheme as is_safe_url

once again, there is:
from django.conf.urls import url

in newer django versions, there is no url but from django.urls import path.

[g-as]

It seems you're not using the latest version, which is compat with Django 4.0.x:

See #317