Licensing undefined in PyPI package

[Henri Yandell]

Noting that the Apache-2.0 licensing is not defined in the PyPI package for 0.6. All you get is:

./PKG-INFO:License: UNKNOWN
./flake8_logging_format.egg-info/PKG-INFO:License: UNKNOWN

[Matthew Gamble]

The readme is also missing from the PyPI web interface.

[Konstantin Shestakov]

I created a PR with this fix, can someone take a look please?
#58