[webauthn] new commits pushed by leshi

The following commits were just pushed by leshi to https://github.com/w3c/webauthn:

* using descriptive names for authenticator selection criteria (#555)

Since we don't directly send the values of the AuthenticatorSelectionCriteria dictionary keys over the wire, it's ok to leave these values in a human-readable form.
  by balfanz
https://github.com/w3c/webauthn/commit/dcf793928221b1883f4c9ac4dd5264b570606e52