Webargs

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Bug fixes:

* Fix form parsing in aiohttp>=2.0.0. Thanks :user:`DmitriyS` for the PR.

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Bug fixes:

* Fix compatibility with marshmallow 3.x.

Other changes:

* Drop support for Python 2.6 and 3.3.
* Support marshmallow>=2.7.0.

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Bug fixes:

* Port fix from release 1.5.2 to `AsyncParser`. This fixes :issue:`146` for ``AIOHTTPParser``.
* Handle invalid types passed to ``DelimitedList`` (:issue:`149`). Thanks :user:`psconnect-dev` for reporting.

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Bug fixes:

* Don't add ``marshmallow.missing`` to ``original_data`` when using ``marshmallow.validates_schema(pass_original=True)`` (:issue:`146`). Thanks :user:`lafrech` for reporting and for the fix.

Other changes:

* Test against Python 3.6.

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Bug fixes:

* Fix handling missing nested args when ``many=True`` (:issue:`120`, :issue:`145`). Thanks :user:`chavz` and :user:`Bangertm` for reporting.
* Fix behavior of ``load_from`` in ``AIOHTTPParser``.

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Features:

* The ``use_args`` and ``use_kwargs`` decorators add a reference to the undecorated function via the ``__wrapped__`` attribute. This is useful for unit-testing purposes (:issue:`144`). Thanks :user:`EFF` for the PR.

Bug fixes:

* If ``load_from`` is specified on a field, first check the field name before checking ``load_from`` (:issue:`118`). Thanks :user:`jasonab` for reporting.