white spaces encoded as '%20' are being converted to '%2520'

[Rasmnev]

I have a url in string that has white spaces enconded as '%20'.
url = 'https://somepath.com/test/Test%20path/my%20test%20file.txt'

when I pass it to URL I get the following:

>>> from urlpath import URL
>>> URL("https://somepath.com/test/Test%20path/my%20test%20file.txt")
URL('https://somepath.com/test/Test%2520path/my%20test%20file.txt')

apparently only happens when the spaces are in the midle of the path.

[brandonschabell]

Thank you for the report! This has been fixed in #11