Log Message:
17.3.0:

Fixed a couple major decoding issues and simplified the URL API.
* limit types accepted by URL.from_text() to just text (str on py3, unicode on py2)
* fix percent decoding issues surrounding multiple calls to URL.to_iri()
* remove the socket-inspired family argument from URL's APIs. It was never \ 
consistently implemented and leaked slightly more problems than it solved.
* Improve authority parsing
* include LICENSE, README, docs, and other resources in the package