[w3c/webauthn] 9d94e5: allow u2f attestation to be chained (#342)

  Branch: refs/heads/master
  Home:   https://github.com/w3c/webauthn
  Commit: 9d94e5ff60cd5cff5d134f391c2cd6f7054f46d8
      https://github.com/w3c/webauthn/commit/9d94e5ff60cd5cff5d134f391c2cd6f7054f46d8
  Author: Alexei Czeskis <alexei@czeskis.com>
  Date:   2017-02-14 (Tue, 14 Feb 2017)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  allow u2f attestation to be chained (#342)

* allow u2f attestation to be chained

* better text wrapping