[w3c/webauthn] 83c45b: make CredFooOptions dict members non-nullable, fix...

  Branch: refs/heads/jeffh-cleanup-easy-issues-wd-06
  Home:   https://github.com/w3c/webauthn
  Commit: 83c45bcf208893a4fe940091ca822f09e4c6455e
      https://github.com/w3c/webauthn/commit/83c45bcf208893a4fe940091ca822f09e4c6455e
  Author: JeffH <Jeff.Hodges@PayPal.com>
  Date:   2017-06-07 (Wed, 07 Jun 2017)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  make CredFooOptions dict members non-nullable, fixes #490