docs: typo in README, preffered to preferrred

[mattmazzola]

Changed preffered to preferred

[dagnelies]

Thanks. While we're at it, out of curiosity, where did you discover this little lib?

[mattmazzola]

where did you discover this little lib?

I was trying to learn about WebAuthN and was searching around for various providers. Started with Auth0 and it was too complicated and still heavily relied on older OAuth fallbacks, then found Passwordless but that library seems poorer quality, then finally found this one and it seems to work for me.

I do still have trouble getting the roaming authenticators to work. (I can register, but not sign in with them) However, the platform authenticators work fine. I think this might be an issue with how I am using it, not the library's problem though.