[webauthn] new commits pushed by vijaybh

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

* Add U2F attestation format

Fixes #214
  by Vijay Bharadwaj
https://github.com/w3c/webauthn/commit/317861f6d932bbdd533be0e802f62117c165eab4

Received on Wednesday, 11 January 2017 18:06:20 UTC