Rest-framework-generic-relations

* Change of maintainer
* Require Python 3.8+, Django 3.2+, DRF 3.12+
* Remove `generic_relations.__version__`. If you need to query the version, use `importlib.metadata.version('rest-framework-generic-relations')` instead.

General dependency update

* Minimum Python version is now 3.6
* Minimum DRF version is now 3.11
* Supported Django versions are now [2.2, 3.1, 3.2]

* Add Python 3.8, Django 3.0 and DRF 3.11 support
* Drop Python 2
* Drop DRF 3.7

Minimum supported dependencies are now:
* Python 3.4
* Django 1.11
* DRF 3.8

* Add error handling for reusing a `Serializer` instance in a `GenericRelatedField`.

* Add Django 2.0 support (need Python min 3.4, Django min. 1.11).

* Add `GenericModelSerializer` as a counterpart to `GenericRelatedField`.
* Dynamically determine the best serializer to use to serialize a model instance.
* Rename `determine_serializer_for_data` to `get_deserializer_for_data`
* Rename `determine_deserializer_for_data` to `get_serializer_for_instance`