Sourced from webargs's changelog.

4.1.0 (2018-09-17)

---

Features:

• Add webargs.testing module, which exposes CommonTestCase
  to third-party parser libraries (see comments in :pr:287).

4.0.0 (2018-07-15)

---

Features:

• Backwards-incompatible: Custom error handlers receive the
  marshmallow.Schema instance as the third argument. Update any
  functions decorated with Parser.error_handler to take a schema
  argument, like so:

.. code-block:: python

# 3.x
[**parser**](https://github.com/parser).error_handler
def handle_error(error, req):
    raise CustomError(error.messages)


# 4.x
[**parser**](https://github.com/parser).error_handler
def handle_error(error, req, schema):
    raise CustomError(error.messages)

See marshmallow-code/marshmallow#840 (comment) <https://github-redirect.dependabot.com/marshmallow-code/marshmallow/issues/840#issuecomment-403481686>_
for more information about this change.

Bug fixes:

• Backwards-incompatible: Rename webargs.async to
  webargs.asyncparser to fix compatibility with Python 3.7
  (:issue:240). Thanks :user:Reskov for the catch and patch.

Other changes:

• Backwards-incompatible: Drop support for Python 3.4 (:pr:243). Python 2.7 and

  =3.5 are supported.

• Backwards-incompatible: Drop support for marshmallow<2.15.0.
  marshmallow>=2.15.0 and >=3.0.0b12 are officially supported.
• Use black <https://github.com/ambv/black>_ with pre-commit <https://pre-commit.com/>_
  for code formatting (:pr:244).

... (truncated)

• 99493f0 Bump version and update changelog
• 5b981a4 Merge pull request #291 from sloria/docs
• 1337b2a Minor travis cleanup
• 9b89fc1 Various docs updates
• 7422d17 Disable pull request review protection
• 7acf60c Merge pull request #288 from sloria/common-test-case
• 78f028b Expose CommonTestCase in webargs.testing
• 3624095 Fix mergify config
• ef16a7a Update mergify config to use label instead of approvals
• 25a38f1 Fix test for marshmallow 3.0.0b14
• Additional commits viewable in compare view

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