Marshmallow

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Bug fixes:

- Fix serialization of ``datetime.time`` objects with microseconds (:issue:`464`). Thanks :user:`Tim-Erwin` for reporting and thanks :user:`vuonghv` for the fix.
- Make ``validates`` consistent with field validator behavior: if validation fails, the field will not be included in the deserialized output (:issue:`391`). Thanks :user:`martinstein` for reporting and thanks :user:`vuonghv` for the fix.

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- ``Decimal`` field coerces input values to a string before deserializing to a `decimal.Decimal` object in order to avoid transformation of float values under 12 significant digits (:issue:`434`, :issue:`435`). Thanks :user:`davidthornton` for the PR.

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Features:

- Allow ``only`` and ``exclude`` parameters to take nested fields, using dot-delimited syntax (e.g. ``only=['blog.author.email']``) (:issue:`402`). Thanks :user:`Tim-Erwin` and :user:`deckar01` for the discussion and implementation.

Support:

- Update tasks.py for compatibility with invoke>=0.13.0. Thanks :user:`deckar01`.

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- Make ``field.parent`` and ``field.name`` accessible to ``on_bind_field`` (:issue:`449`). Thanks :user:`immerrr`.

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No code changes in this release. This is a reupload in order to distribute an sdist for the last hotfix release. See :issue:`443`.

Support:

- Update license entry in setup.py to fix RPM distributions (:issue:`433`). Thanks :user:`rrajaravi` for reporting.

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Bug fixes:

- Only add Schemas to class registry if a class name is provided. This allows Schemas to be
constructed dynamically using the ``type`` constructor without getting added to the class registry (which is useful for saving memory).