[webauthn] Pull Request: Clarify U2F attestation verification instructions

emlun has just submitted a new pull request for https://github.com/w3c/webauthn:

== Clarify U2F attestation verification instructions ==
This fixes #857.

See https://github.com/w3c/webauthn/pull/861

Received on Wednesday, 4 April 2018 14:20:53 UTC