Windows: "ol --configure" doesn't work on gitbash

This is because getpass() doesn't work on gitbash. A simple fix is to call it with winpty:
`$ winpty ol --configure --email user@example.org`
In other words, the fix would be to add a couple lines to README.md.

While we're at it, I'd like to suggest using the above email address, because as currently written, it originally made me think that an email address at archive.org was needed.