* Changes to the paginator defaults and settings
Require a default paginator be specified when using the page size
setting.
https://github.com/encode/django-rest-framework/issues/5168
* DRF-5168 import warnings
missed this in last commit
* Add a system checks file
Add a check for pagination settings for the 3.7 upgrade cycle.
* more compatible import approach
* missing bactic
* revised language and approach to import the system check
Adds a rest framework app config.
* Adjust doc wording
