Marshmallow-sqlalchemy

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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.

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Bug fixes:

* Avoid error when using ``SQLAlchemyAutoSchema``, ``ModelSchema``, or ``fields_for_model``
with a model that has a ``SynonymProperty`` (:issue:`190`).
Thanks :user:`TrilceAC` for reporting.
* ``auto_field`` and ``field_for`` work with ``SynonymProperty`` (:pr:`280`).

Other changes:

* Add hook in ``ModelConverter`` for changing field names based on SQLA columns and properties (:issue:`276`).
Thanks :user:`davenquinn` for the suggestion and the PR.