Upgrade py-noseofyeti to version 1.8.

• Python3 Compatibility with the plugins
• Nose2 support!
• NoseOfYeti now understands and respects the async keyword. Only really useful if you use something like https://asynctest.readthedocs.io/en/latest/
• Changed the license to MIT from GPL

Add LICENSE.

Pet portlint.

Sponsored by: Farsight Security, Inc.