[w3c/webauthn] 301468: move the credentialId uniqueness handling to the f...

  Branch: refs/heads/cred-id-uniqueness-579
  Home:   https://github.com/w3c/webauthn
  Commit: 301468b06be063f61f054bcfca079d1598aad867
      https://github.com/w3c/webauthn/commit/301468b06be063f61f054bcfca079d1598aad867
  Author: rlin1 <rolf@noknok.com>
  Date:   2017-12-06 (Wed, 06 Dec 2017)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  move the credentialId uniqueness handling to the formal alg steps. Close #579