Bump pylint from 2.5.3 to 2.6.0 (#67)

Bumps [pylint](https://github.com/PyCQA/pylint) from 2.5.3 to 2.6.0.
- [Release notes](https://github.com/PyCQA/pylint/releases)
- [Changelog](https://github.com/PyCQA/pylint/blob/master/ChangeLog)
- [Commits](https://github.com/PyCQA/pylint/compare/pylint-2.5.3...pylint-2.6.0

)

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requirements.dev.txt

 flake8==3.8.3
-pylint==2.5.3
+pylint==2.6.0
 pytest==5.4.3
 pytest-watch==4.2.0