Another Credential Management editor

HI Mike and all,

@Nina Satragno <nsatragno@google.com> wishes to sign up formally as
a Credential Management editor. She's been contributing to the WebAuthn spec
<https://github.com/w3c/webauthn/issues?q=nsatragno> for a while now, and
has recently begun contributing to Credman
<https://github.com/w3c/webappsec-credential-management/issues?q=nsatragno>.
Shall I add her as such to the Credman title page?

thanks,

=JeffH