Marshmallow-sqlalchemy

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* ``auto_field`` supports ``association_proxy`` fields with local multiplicity
(``uselist=True``) (:issue:`364`). Thanks :user:`Unix-Code`
for the catch and patch.

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* ``auto_field`` works with ``association_proxy`` (:issue:`338`).
Thanks :user:`AbdealiJK`.

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* *Backwards-incompatible*: Drop support for marshmallow 2.x, which is now EOL.
* Test against Python 3.9.

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Bug fixes:

* Don't add no-op `Length` validator (:pr:`315`). Thanks :user:`taion` for the PR.

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Bug fixes:

* Fix data keys when using ``Related`` with a ``Column`` that is named differently
from its attribute (:issue:`299`). Thanks :user:`peterschutt` for the catch and patch.
* Fix bug that raised an exception when using the `ordered = True` option on a schema that has an `auto_field` (:issue:`306`).
Thanks :user:`KwonL` for reporting and thanks :user:`peterschutt` for the PR.

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Bug fixes:

* Fix ``DeprecationWarning`` getting raised even when user code does not use
``TableSchema`` or ``ModelSchema`` (:issue:`289`).
Thanks :user:`5uper5hoot` for reporting.