[w3c/webauthn] 964aa6: fix #1012 determine Attested Credential Data lengt...

  Branch: refs/heads/master
  Home:   https://github.com/w3c/webauthn
  Commit: 964aa6c1eceaf922816573a639dec63fbcad9716
      https://github.com/w3c/webauthn/commit/964aa6c1eceaf922816573a639dec63fbcad9716
  Author: =JeffH <mobileuser@kingsmountain.com>
  Date:   2018-08-14 (Tue, 14 Aug 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  fix #1012 determine Attested Credential Data length (#1023)

* fix #1012 determine attsCredData length

* fix grammar



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