[w3c/webauthn] 91e4c0: [administrivia] Add previous version link

  Branch: refs/heads/master
  Home:   https://github.com/w3c/webauthn
  Commit: 91e4c05962fcf6f7306c2c9d9a298d8802021ba3
      https://github.com/w3c/webauthn/commit/91e4c05962fcf6f7306c2c9d9a298d8802021ba3
  Author: Vijay Bharadwaj <vijaybh@users.noreply.github.com>
  Date:   2016-09-02 (Fri, 02 Sep 2016)

  Changed paths:
    M index.bs

  Log Message:
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  [administrivia] Add previous version link