[w3c/webauthn] 958a9d: Fix #715 - add a conformance class note for FIDO U...

  Branch: refs/heads/master
  Home:   https://github.com/w3c/webauthn
  Commit: 958a9d1c1cb2c8a9b29c9fab6aa87db3f4ae18f8
      https://github.com/w3c/webauthn/commit/958a9d1c1cb2c8a9b29c9fab6aa87db3f4ae18f8
  Author: J.C. Jones <james.jc.jones@gmail.com>
  Date:   2018-01-12 (Fri, 12 Jan 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Fix #715 - add a conformance class note for FIDO U2F Attesation Types (#740)

Editorial fix: Note that U2F authenticators can't store-and-return a user
handle.