Bump webargs from 4.1.2 to 4.2.0

[dependabot-preview]

Bumps webargs from 4.1.2 to 4.2.0.

Changelog

Sourced from webargs's changelog.

4.2.0 (2018-12-27)

---

Features:

• Add force_all argument to use_args and use_kwargs
  (:issue:252, :issue:307). Thanks :user:piroux for reporting.
• The status_code and headers arguments to ValidationError
  are deprecated. Pass error_status_code and error_headers to
  Parser.parse, Parser.use_args, and Parser.use_kwargs instead.
  (:issue:327, :issue:336).
• Custom error handlers receive error_status_code and error_headers arguments.
  (:issue:327).

.. code-block:: python

# <4.2.0
[**parser**](https://github.com/parser).error_handler
def handle_error(error, req, schema):
    raise CustomError(error.messages)


class MyParser(FlaskParser):
    def handle_error(self, error, req, schema):
        # ...
        raise CustomError(error.messages)


# >=4.2.0
[**parser**](https://github.com/parser).error_handler
def handle_error(error, req, schema, status_code, headers):
    raise CustomError(error.messages)


# OR


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


class MyParser(FlaskParser):
    def handle_error(self, error, req, schema, status_code, headers):
        # ...
        raise CustomError(error.messages)

    # OR

    def handle_error(self, error, req, **kwargs):

... (truncated)

Commits

• b5404fb Bump version and update changelog
• fef17ba Merge pull request #345 from marshmallow-code/docs
• e92271a Update repo links to marshmallow-code/webargs; add COC
• 244b837 Change sphinx theme to sphinx-typlog-theme
• bb7e131 Merge pull request #338 from sloria/deprecate-status-code
• da2d2fb Bump sphinx-issues from 1.1.0 to 1.2.0
• f70882d Bump sphinx from 1.8.2 to 1.8.3
• 32e8d7e Remove documentation for status_code; fix examples
• 18b3573 Fix pyramid parsing; respect error_headers argument
• cdac38e Deprecate status and headers params of ValidationErrors
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #312.