Update appdirs to 1.4.4

[pyup-bot]

This PR updates appdirs from 1.4.3 to 1.4.4.

Changelog

1.4.4

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- [PR 92] Don't import appdirs from setup.py which resolves issue 91
- [PR 100] Corrects the config directory on OSX/macOS, which resolves issue 63.

Project officially classified as Stable which is important
for inclusion in other distros such as ActivePython.

Links

• PyPI: https://pypi.org/project/appdirs
• Changelog: https://pyup.io/changelogs/appdirs/
• Repo: http://github.com/ActiveState/appdirs