Automagic-rest

What's Changed
* Lock `django-filter` at version `21.1`
* Version `22.1` breaks support for `djangorestframework-filters==1.0.0.dev2`, the latest release.
* This is not ideal, but works for now. We will have to come up with a long-term plan, as it appears `djangorestframework-filters` is no longer maintained.

**Full Changelog**: https://github.com/wharton/automagic-rest/compare/0.4.1...0.4.2

What's Changed
* Add support for `json` and `jsonb` PostgreSQL columns
* Ignore un-supported columns with a warning (such as `ts_vector`)

**Full Changelog**: https://github.com/wharton/automagic-rest/compare/0.4.0...0.4.1

What's Changed
* `__in` lookups are now supported for all filter fields, such as `ticker__in=IBM,MSFT,AAPL`.
* A bug was fixed that caused the filter fields to be rendered twice in the DRF HTML browsable interface.
* README was updated.

**Full Changelog**: https://github.com/wharton/automagic-rest/compare/0.3.0...0.4.0

- Add support for `get_extra_sql`, to customize the `WHERE` clause in the `information_schema` query.
- Remove errant exclusion of tables ending in `chars`

* Fixes a bug exposed in Django 3.2 with AppConfig. This will now work properly with Django 3.2.

* Upgrades Django REST Framework Filters to `1.0.0dev2` from `1.0.0dev0`
* Adds support in the mapping for `internal` -> `DurationField`.