Update the package to Python 3

[HGStyle]

You literaly just need to replace only one line !
This line:

import urllib2

Need to be replaced by this line:

import urllib.request as urllib2

If you want that Python2 and Python3 are supported, replace the import urllib2 line by:

import sys
if int(sys.version_info[0]) > 2:
    import urllib.request as urllib2
else:
    import urllib2

Please, change this in the code, then republish the package on PyPI.
Thanks !