[w3c/webauthn] b90f7f: add 'spec roadmap' section (#375)

  Branch: refs/heads/master
  Home:   https://github.com/w3c/webauthn
  Commit: b90f7f53e713a8a2cc36c8b973acd698e854c34f
      https://github.com/w3c/webauthn/commit/b90f7f53e713a8a2cc36c8b973acd698e854c34f
  Author: =JeffH <mobileuser@kingsmountain.com>
  Date:   2018-09-12 (Wed, 12 Sep 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  add 'spec roadmap' section  (#375)

merging per agreement on 12-Sep-2018 call.

* add 'spec roadmap' section as discussed with vijaybh'

* fix minor mispelling

* re-write and incorp vijaybh's feedback

* fix BS's bs objections to my source formatting...

* fix typo, thx apowers313 :)

* revise Note, thx emlun!

* polish

* fix an oops

* fix oopsies and try to polish

* update per emlun's comment, thx!



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