[webauthn] new commits pushed by AngeloKai

The following commits were just pushed by AngeloKai to https://github.com/w3c/webauthn:

* 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
  by Angelo Liao

Received on Wednesday, 20 September 2017 17:29:30 UTC