Django 2.2.6 needs `get_queryset` instead of `get_query_set`

[elmcrest]

besides thx very much for this "snippet/app", I didn't installed it via pip though, but it's still useful since you can grab up some more matured implementation. I actually did find this because my own naive approach was buggy for some reason :)

so maybe some unit tests would be useful for this particular issue, I can't tell right now since when it's broken.

cheers