Update marshmallow-sqlalchemy to 0.26.0

[pyup-bot]

This PR updates marshmallow-sqlalchemy from 0.24.2 to 0.26.0.

Changelog

0.26.0

+++++++++++++++++++

Bug fixes:

* Unwrap proxied columns to handle models for subqueries (:issue:`383`).
Thanks :user:`mjpieters` for the catch and patch
* Fix setting ``transient`` on a per-instance basis when the
``transient`` Meta option is set (:issue:`388`).
Thanks again :user:`mjpieters`.

Other changes:

* *Backwards-incompatible*: Remove deprecated ``ModelSchema`` and ``TableSchema`` classes.

0.25.0

+++++++++++++++++++

* Add ``load_instance`` as a parameter to `SQLAlchemySchema` and `SQLAlchemyAutoSchema` (:pr:`380`).
Thanks :user:`mjpieters` for the PR.

0.24.3

+++++++++++++++++++

* Fix deprecation warnings from marshmallow 3.10 and SQLAlchemy 1.4 (:pr:`369`).
Thanks :user:`peterschutt` for the PR.

Links

• PyPI: https://pypi.org/project/marshmallow-sqlalchemy
• Changelog: https://pyup.io/changelogs/marshmallow-sqlalchemy/
• Repo: https://github.com/marshmallow-code/marshmallow-sqlalchemy

[coveralls]

Coverage remained the same at 86.667% when pulling a264cd3 on pyup-update-marshmallow-sqlalchemy-0.24.2-to-0.26.0 into e3b6dee on master.

[pyup-bot]

Closing this in favor of #309