[w3c/webauthn] 7131b9: fix some grammar, add bikeshed clarifications, add...

  Branch: refs/heads/master
  Home:   https://github.com/w3c/webauthn
  Commit: 7131b932bd41f0307aa275d1cbf1bce688265756
      https://github.com/w3c/webauthn/commit/7131b932bd41f0307aa275d1cbf1bce688265756
  Author: =JeffH <Jeff.Hodges@KingsMountain.com>
  Date:   2016-09-13 (Tue, 13 Sep 2016)

  Changed paths:
    M README.md

  Log Message:
  -----------
  fix some grammar, add bikeshed clarifications, add link to official w3.org/tr/webauthn/, link to CONTRIBUTING.md (#197)