[webauthn] Closed Pull Request: Add Rec to previous version

wseltzer has just closed wseltzer's pull request 1227 for https://github.com/w3c/webauthn:

== Add Rec to previous version ==
Prep for Level 2


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<a href="https://pr-preview.s3.amazonaws.com/w3c/webauthn/pull/1227.html" title="Last updated on Jun 3, 2019, 4:18 PM UTC (3389abd)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/webauthn/1227/db94f4a...3389abd.html" title="Last updated on Jun 3, 2019, 4:18 PM UTC (3389abd)">Diff</a>

See https://github.com/w3c/webauthn/pull/1227