Bump pylint from 2.7.2 to 2.7.4 (#102)

Bumps [pylint](https://github.com/PyCQA/pylint) from 2.7.2 to 2.7.4.
- [Release notes](https://github.com/PyCQA/pylint/releases)
- [Changelog](https://github.com/PyCQA/pylint/blob/master/ChangeLog)
- [Commits](pylint-dev/pylint@pylint-2.7.2...pylint-2.7.4)

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