* Add URLPattern options to django.url.conf since they were missing.
* Fix some wording in the contribution guide & fix a reference to Django version 3.0, which has since been replaced by 3.1 as new stable version.
* My bad - I was misreading the type hints a bit here. Fix tests.
* We need to specify the List[Union[URLResolver, URLPattern]] upfront, since those don't accept List[URLResolver] as argument.
* Add test to ensure that path() accepts a mix of URLPatterns & URLResolvers.
Co-authored-by: LanDinh <coding+sourcetree@khaleesi.ninja>
