Django-auto-prefetch

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* Support Python 3.10.

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* Fix versions advertised in README.

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* Support Django 3.2.

* Add system check that the ``Meta`` class is inherited in all subclasses.

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* Fix model subclasses’ default manager back to ``objects`` rather than
``prefetch_manager``.

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* Remove tests from built package.

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* Fix pickled model instances. Instances loaded from pickle remove their peer
tracking so will be subject to 1+N queries for any foreign key access.