[w3c/webauthn] e320eb: use 'attacker' instead of 'user'

  Branch: refs/heads/issue-1014-username-enum-weiler
  Home:   https://github.com/w3c/webauthn
  Commit: e320eb54bde33e2ec31d36193188b70a29d8bdf0
      https://github.com/w3c/webauthn/commit/e320eb54bde33e2ec31d36193188b70a29d8bdf0
  Author: Samuel Weiler <weiler@w3.org>
  Date:   2018-09-05 (Wed, 05 Sep 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  use 'attacker' instead of 'user'



      **NOTE:** This service has been marked for deprecation: https://developer.github.com/changes/2018-04-25-github-services-deprecation/

      Functionality will be removed from GitHub.com on January 31st, 2019.