[w3c/webauthn] f37cfc: Address security and privacy issues witht the icon...

  Branch: refs/heads/master
  Home:   https://github.com/w3c/webauthn
  Commit: f37cfc5dfd074832ab61ed299d1ee7d2a6f5c724
      https://github.com/w3c/webauthn/commit/f37cfc5dfd074832ab61ed299d1ee7d2a6f5c724
  Author: Angelo Liao <huliao@microsoft.com>
  Date:   2017-09-20 (Wed, 20 Sep 2017)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Address security and privacy issues witht the iconURL (#545)

* fix proper subset tweak

* added a priori constraint on iconURL per credman spec

* reference the CR version of Mixed Content instead of editors draft