[w3c/webauthn] c0fc95: Add link to security consideration from makeCreden...

  Branch: refs/heads/issue-85-challenge-recommendations
  Home:   https://github.com/w3c/webauthn
  Commit: c0fc95017dd8f6da6cae0a93cbbb3bb3bd1d8e76
      https://github.com/w3c/webauthn/commit/c0fc95017dd8f6da6cae0a93cbbb3bb3bd1d8e76
  Author: Emil Lundberg <emil@yubico.com>
  Date:   2018-04-04 (Wed, 04 Apr 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Add link to security consideration from makeCredential challenge parameter