Remove additional remnants of flake8

remove flake8 and suggest pycqa/flake8

Run pre-commit autoupdate

Committed via https://github.com/asottile/all-repos

[#465] Handled multiline dependencies

Document formatting

Use covdefaults to handle coveragerc

Fix docs for pretty-format-json: default indent is **2** spaces.

pre-commit-hooks: python3.6.1+

Extend deprecation message to description

This will make it show up on https://pre-commit.com/hooks.html

Allow arbitrarily encoded files to be checked with detect-aws-credentials

debug statements - add wdb

Skip empty key variables in detect_aws_credentials

pre-commit-hooks: python3.6+

officially deprecate the flake8 hook

Allow linking directly to each hook

Fix CI by upgrading AP templates

Document mixed-line-ending limitation for fix={crlf,lf} with git.