Bump webargs from 4.1.2 to 5.1.0

[dependabot-preview]

Bumps webargs from 4.1.2 to 5.1.0.

Changelog

Sourced from webargs's changelog.

5.1.0 (2019-01-11)

---

Features:

• Error handlers for AsyncParser classes may be coroutine functions.
• Add type annotations to AsyncParser and AIOHTTPParser.

Bug fixes:

• Fix compatibility with Flask<1.0 (:issue:355).
  Thanks :user:hoatle for reporting.
• Address warning on Python 3.7 about importing from collections.abc.

5.0.0 (2019-01-03)

---

Features:

• Backwards-incompatible: A 400 HTTPError is raised when an
  invalid JSON payload is passed. (:issue:329).
  Thanks :user:zedrdave for reporting.

Other changes:

• Backwards-incompatible: webargs.argmap2schema is removed. Use
  webargs.dict2schema instead.
• Backwards-incompatible: webargs.ValidationError is removed.
  Use marshmallow.ValidationError instead.

.. code-block:: python

# <5.0.0
from webargs import ValidationError


def auth_validator(value):
    # ...
    raise ValidationError("Authentication failed", status_code=401)


[**use**](https://github.com/use)_args({"auth": fields.Field(validate=auth_validator)})
def auth_view(args):
    return jsonify(args)


# >=5.0.0
from marshmallow import ValidationError

... (truncated)

Commits

• f12c0b8 Bump version and update changelog
• 5dca902 Merge pull request #356 from marshmallow-code/fix-flask-compat
• aab5c06 Fix Flask<1.0 compatibility
• c7ac24e Merge pull request #354 from marshmallow-code/warnings
• 630d50f Address warning on Python 3.7 about importing from collections.abc
• ab6e21a Show example of file upload and marshmallow 3 data_key usage
• af6cb39 Remove outdated warning about aiohttp<2 support
• e4b118d Add type annotations to AsyncParser and AIOHTTPParser
• fd5ceb9 Allow error handler to be a coroutine
• 011be9f Remove workaround for ad blockers
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #331.