[w3c/webauthn] 57ab45: fix #792: use utf 8 decode directly (#793)

  Branch: refs/heads/master
  Home:   https://github.com/w3c/webauthn
  Commit: 57ab456f93afbd13ac1cd179996760a89be3c84d
      https://github.com/w3c/webauthn/commit/57ab456f93afbd13ac1cd179996760a89be3c84d
  Author: =JeffH <mobileuser@kingsmountain.com>
  Date:   2018-02-10 (Sat, 10 Feb 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  fix #792: use utf 8 decode directly (#793)

* use UTF-8 decode alg directly

* grammatical addition

* ditto

* add JSON explicit parsing step

* fixup inter-step references, thx emlun!

* apply same changes to #verifying-assertion

* ident |C| as being client data