Update CLASSIFY_EXE_RE to parse ntlk win package

[chrispbailey]

If you specify a python version, then hashin filters the releases but can't parse the win binary for the nltk package.

hashin --python-version 3.6 nltk==3.2.4
https://pypi.org/pypi/nltk/json
Unrecognizable url: https://files.pythonhosted.org/packages/26/01/0330e3ba13628827f10fcd6c3c8d778a5aa3e4d0a09d05619f074ba2d87e/nltk-3.2.4.win32.exe

[peterbe]

Can you please add a unit test?

[chrispbailey]

The structure of nltk-3.2.4.win32.exe does not contain a python version so technically the release_url_metadata returns python_version=win32. I'm not going to change the regex any further because I don't know what the consequences of making the python_version optional are (there are not enough tests here to ensure this doesn't break anything).

[peterbe]

So this change made it possible for you to install nltk on windows with hashin and that was not possible before. I think that's good enough. THANKS!

[peterbe]

Version 0.13.3 pushed to pypi.