Bumps [pytest](https://github.com/pytest-dev/pytest) from 3.6.3 to 3.6.4.
- [Release notes](http...

Update pre-commit to 1.10.4

Pass schema instance to error handlers

* @error_handler and handle_error receive schema instance
* In Flask, the Schema instance is att...

...Also, use :pr: role in some recent changelog entries

Update sphinx-issues to 1.0.0

Update tox to 3.1.2

Update invoke to 1.1.0

Address a few warnings and bump required marshmallow version

It contains a bugfix that allows strict parameter to override
Meta.strict.

Format code and docs with black+blacken-docs+pre-commit

Update tox to 3.1.1

Drop support for Python 3.4

3.4 is over 4 years old, and Python 3.7 has been released.
Let's move forward.

Python 3.7 async and await are now reserved keywords.

Update pytest to 3.6.3

ValidationError.fields was removed in marshmallow 3.0.0b12

Update webtest to 2.0.30

Update pytest to 3.6.2

Respect DEFAULT_VALIDATION_STATUS set on Parser

Update pytest to 3.6.1

see https://github.com/sloria/webargs/issues/180#issuecomment-394869645

Update pytest to 3.6.0

Update invoke to 1.0.0

Attempts to address #225

Pass request to error handler

Skip aiohttp tests for python<3.5; Drop support for aiohttp<3

Newer aiohttp versions drop py34 support

Minor refactor in core.py

Update invoke to 0.23.0

Tests: Don't set DEBUG mode in Flask TestAppConfig

Update .gitignore

Update pytest to 3.5.1

Update flake8-quotes to 1.0.0

Update tox to 3.0.0

Update flake8-quotes to 0.14.1

In marshmallow 3, data_key replaces load_from

Update pytest to 3.5.0

Minor rework of Parser.parse

Fix small typo

Update flake8-quotes to 0.14.0

Update pytest to 3.4.2

close #186