Apispec

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Features:

- Document ``deprecated`` property from field metadata (:pr:`686`).
Thanks :user:`greyli` for the PR.
- Document ``writeOnly`` and ``nullable`` properties from field metadata
(:pr:`684`). Thanks :user:`greyli` for the PR.

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Features:

- Support ``Pluck`` field (:pr:`677`). Thanks :user:`mjpieters` for the PR.
- Support ``TimeDelta`` field (:pr:`678`).

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Features:

- Support OpenAPI 3.1.0 (:issue:`579`).

Bug fixes:

- Fix ``get_fields`` to avoid crashing when a field is named ``fields``
(:issue:`673`). Thanks :user:`Reskov` for reporting.

Other changes:

- Don't pass field metadata as keyword arguments in the tests. This is
deprecated since marshmallow 3.10. apispec is still compatible with
marshmallow >=3,<3.10 but tests now require marshmallow >=3.10. (:pr:`675`)

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Bug fixes:

- Respect ``partial`` marshmallow schema parameter: don't document the field as
required. (:issue:`627`). Thanks :user:`Anti-Distinctlyminty` for the PR.

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Bug fixes:

- Don't set ``additionalProperties`` if ``Meta.unknown`` is ``EXCLUDE``
(:issue:`659`). Thanks :user:`kupuguy` for the PR.

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Features:

- Populate ``additionalProperties`` from ``Meta.unknown`` (:pr:`635`).
Thanks :user:`timsilvers` for the PR.
- Allow ``to_yaml`` to pass kwargs to ``yaml.dump`` (:pr:`648`).
- Resolve header references in responses (:pr:`650`).
- Resolve example references in parameters, request bodies and responses
(:pr:`651`).