* Drop support for marshmallow 2, which is now EOL (:pr:`332`).
Bug fixes:
* Fix behavior when serializing ``None`` (:pr:`302`). Thanks :user:`mahenzon`.
Other changes:
* Test against Python 3.8 and 3.9 (:pr:`332`).
0.23.2
===================
Bug fixes:
* Import from `collections.abc` for forward-compatibility with Python 3.10 (:issue:`318`). Thanks :user:`tirkarthi`.
0.23.1
===================
Bug fixes:
* Fix nested fields validation error formatting (:issue:`120`). Thanks :user:`mahenzon` and :user:`debonzi` for the PRs.
0.23.0
===================
* Improve performance of link generation from `Relationship` (:issue:`277`). Thanks :user:`iamareebjamal` for reporting and fixing.
0.22.0
===================
Deprecation/Removals:
* Drop support for Python 2.7 and 3.5. Only Python>=3.6 is supported (:issue:`251`). * Drop support for marshmallow 3 pre-releases. Only stable versions >=2.15.2 are supported. * Remove ``fields.Meta``.
Bug fixes:
* Address ``DeprecationWarning`` raised by ``Field.fail`` on marshmallow 3.
0.21.2
===================
Bug fixes:
* marshmallow 3.0.0rc7 compatibility (:pr:`233`).
Other changes:
* Format with pyupgrade and black (:pr:`235`). * Switch to Azure Pipelines for CI (:pr:`234`).