pylint: Missing dependencies
pylint is missing some dependencies:
- mccabe (needs Python 3 builds)
- six
- isort
- astroid (needs updating to at least v1.5.1)
See: https://github.com/PyCQA/pylint/blob/pylint-1.7.4/pylint/*pkginfo*.py\#L24
(from redmine: issue id 8110, created on 2017-11-07, closed on 2019-05-03)