Cannot install npm in Windows 10

[ziong]

when try to install with
nodeenv --node=10.16.0 --npm=6.4.1 env
I got the error "urllib.error.HTTPError: HTTP Error 404: Not Found"

seems that the zip file should have prefix "v"
my workaround:
i change the file nodeenv.py line 742 (inside install_npm_win())
from
npm_url = 'https://github.com/npm/cli/archive/%s.zip' % opt.npm
to
npm_url = 'https://github.com/npm/cli/archive/v%s.zip' % opt.npm

[Lucas-C]

This has been fixed by #233