Marshmallow

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Features:

- Add ``timestamp`` and ``timestamp_ms`` formats to ``fields.DateTime``
(:issue:`612`).
Thanks :user:`vgavro` for the suggestion and thanks :user:`vanHoi` for
the PR.

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Features:

- Add ``Enum`` field (:pr:`2017`) and (:pr:`2044`).

Bug fixes:

- Fix typing in ``Field._serialize`` signature (:pr:`2046`).

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Bug fixes:

- Add return type to ``fields.Email.__init__`` (:pr:`2018`).
Thanks :user:`kkirsche` for the PR.
- Add missing type hint to IPInterface __init__ (:pr:`2036`).

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Features:

- Support serialization as float in ``TimeDelta`` field (:pr:`1998`).
Thanks :user:`marcosatti` for the PR.
- Add ``messages_dict`` property to ``ValidationError`` to facilitate type checking
(:pr:`1976`).
Thanks :user:`sirosen` for the PR.

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Features:

- Raise ``ValueError`` if an invalid value is passed to the ``unknown``
argument (:issue:`1721`, :issue:`1732`).
Thanks :user:`sirosen` for the PR.

Other changes:

- Set lower bound for ``packaging`` requirement (:issue:`1957`).
Thanks :user:`MatthewNicolTR` for reporting and thanks :user:`sirosen` for the PR.
- Improve warning messages by passing ``stacklevel`` (:pr:`1986`).
Thanks :user:`tirkarthi` for the PR.

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Features:

- Allow passing a ``dict`` to ``fields.Nested`` (:pr:`1935`).
Thanks :user:`sirosen` for the PR.

Other changes:

- Address distutils deprecation warning in Python 3.10 (:pr:`1903`).
Thanks :user:`kkirsche` for the PR.
- Add py310 to black target-version (:pr:`1921`).
- Drop support for Python 3.6 (:pr:`1923`).
- Use postponed evaluation of annotations (:pr:`1932`).
Thanks :user:`Isira-Seneviratne` for the PR.