[webauthn] new commits pushed by WebAuthnBot

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

* Built by Travis-CI: 51ec228afc78b51abe1ee1fc6caa9f957a34d4f7 Merge pull request #687 from w3c/issue-184
  by Travis-CI
https://github.com/w3c/webauthn/commit/6f88ff2c3216f8f306a9ca97e17973520590bb07

Received on Wednesday, 17 January 2018 18:33:13 UTC