Constructor should encode Unicode input as Punycode

[ypcrts]

Goal: implement RFC3492 https://tools.ietf.org/html/rfc3492

In the constructor, Unicode input should be encoded as Punycode.

TODO:

• Use punycode from the python3 codecs library. https://docs.python.org/3/library/codecs.html
• Investigate whether this will work in python 2.7, if not devise a plan

[wakemaster39]

I think saving some sanity and dropping python 2 is a smart move. The last release ever is done now and officially retired as of Jan 1. I am a hard ass on this one though and trying to force people off of legacy python.

https://pypi.org/project/idna/ this one might solve both the python2.7 problem and make life a little easier. Saves having to figure out striping - off the end of strings if they are only ascii characters "test.com".encode('punycode') -> test.com-

Need to be careful with cached properties and how do you extract the original form of the URL if thats something that needs supporting.