Update netifaces to 0.10.8

[pyup-bot]

This PR updates netifaces from 0.10.5 to 0.10.8.

Changelog

0.10.8

* Fixed a bug that in certain circumstances could lead to an infinite
 loop in netifaces.gateways() (thanks asomers).
 * Fixed a memory management bug in an error path (thanks NicoPy).

0.10.7

* Added LICENSE file
 * Automated Windows builds via AppVeyor.

0.10.6

* Fixed netmask determination on Windows.
 * All addresses are now unicode strings on all platforms,
 regardless of Python version.

Links

• PyPI: https://pypi.org/project/netifaces
• Changelog: https://pyup.io/changelogs/netifaces/
• Repo: https://github.com/al45tair/netifaces

[pyup-bot]

Closing this in favor of #184