[w3c/webauthn] a7afbf: Change id -> ID

  Branch: refs/heads/issue-716-pkcd-id-case
  Home:   https://github.com/w3c/webauthn
  Commit: a7afbff1bd6e00bebe323dc030e89af8a07cf0db
      https://github.com/w3c/webauthn/commit/a7afbff1bd6e00bebe323dc030e89af8a07cf0db
  Author: Emil Lundberg <emil@yubico.com>
  Date:   2017-12-08 (Fri, 08 Dec 2017)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Change id -> ID