Update pylint to 2.7.4

[pyup-bot]

This PR updates pylint from 2.7.3 to 2.7.4.

Changelog

2.7.4

===========================
Release date: 2021-03-30


* Fix a problem with disabled msgid not being ignored

Closes 4265

* Fix issue with annotated class constants

* Closes 4264

Links

• PyPI: https://pypi.org/project/pylint
• Changelog: https://pyup.io/changelogs/pylint/
• Repo: https://github.com/PyCQA/pylint

[coveralls]

Coverage remained the same at 86.667% when pulling 5729874 on pyup-update-pylint-2.7.3-to-2.7.4 into e3b6dee on master.

[pyup-bot]

Closing this in favor of #283