[w3c/webauthn] ac03dd: be explicit re SHA-256

  Branch: refs/heads/jeffh-fix-932-rpidhashgen
  Home:   https://github.com/w3c/webauthn
  Commit: ac03ddefd5ff0993227fa99a342e615aeac548a8
      https://github.com/w3c/webauthn/commit/ac03ddefd5ff0993227fa99a342e615aeac548a8
  Author: JeffH <Jeff.Hodges@PayPal.com>
  Date:   2018-06-08 (Fri, 08 Jun 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  be explicit re SHA-256



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