[w3c/webauthn] 50c961: fix build by adding the proverbial missing comma.....

  Branch: refs/heads/jeffh-user-verification-357-358
  Home:   https://github.com/w3c/webauthn
  Commit: 50c961f9bde63c4a7d9064099f6bc7419adcbebf
      https://github.com/w3c/webauthn/commit/50c961f9bde63c4a7d9064099f6bc7419adcbebf
  Author: JeffH <Jeff.Hodges@PayPal.com>
  Date:   2017-03-01 (Wed, 01 Mar 2017)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  fix build by adding the proverbial missing comma...