[webauthn] new commits pushed by emlun

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

* Copy changes from #736

As requested by @equalsJeffH at
https://github.com/w3c/webauthn/pull/736#issuecomment-357309766
  by Emil Lundberg
https://github.com/w3c/webauthn/commit/f716b7fcfa4be4566a88a6f7b18b51804e66c721

Received on Friday, 12 January 2018 18:06:15 UTC