[w3c/webauthn] f94573: update tokbind ref to published RFC8471

  Branch: refs/heads/jeffh-fix-1086-tokbind-ref
  Home:   https://github.com/w3c/webauthn
  Commit: f945730b48dddcae640c0bdf3dbd8f01ba896ed5
      https://github.com/w3c/webauthn/commit/f945730b48dddcae640c0bdf3dbd8f01ba896ed5
  Author: JeffH <Jeff.Hodges@KingsMountain.com>
  Date:   2018-10-09 (Tue, 09 Oct 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  update tokbind ref to published RFC8471



      **NOTE:** This service has been marked for deprecation: https://developer.github.com/changes/2018-04-25-github-services-deprecation/

      Functionality will be removed from GitHub.com on January 31st, 2019.