2017-10-31, Version 8.9.0 'Carbon' (LTS) Release

This LTS release comes with 87 commits. This includes 30 that are
updates to lib/ or src/, 20 that are test related, 13 that are doc
related, 19 which are build / tools related, and 4 commits which are
updates to dependencies.

Notable Changes:

* doc:
  - add Gibson Fahnestock to Release team (Gibson Fahnestock)
    https://github.com/nodejs/node/pull/16620
* deps:
  - update npm to 5.5.1 (Myles Borins)
    https://github.com/nodejs/node/pull/16509
* http2:
  - The exposed http2 socket is no longer manipulatable
    (Anatoli Papirovski)
    https://github.com/nodejs/node/pull/16330
* module:
  - support custom paths to require.resolve() (cjihrig)
    https://github.com/nodejs/node/pull/16397
* util:
  - util.TextEncoder and util.TextDecoder are no longer experimental.
    There will no longer be a warning when they are used
    (James M Snell)
    https://github.com/nodejs/node/pull/15743

PR-URL: https://github.com/nodejs/node/pull/16630