doc: add whitlockjc to collaborators

PR-URL: #5665
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>

Author: whitlockjc

README.md

@@ -429,6 +429,7 @@ information about the governance of the Node.js project, see
 * [thlorenz](https://github.com/thlorenz) - **Thorsten Lorenz** <thlorenz@gmx.de>
 * [tunniclm](https://github.com/tunniclm) - **Mike Tunnicliffe** <m.j.tunnicliffe@gmail.com>
 * [vkurchatkin](https://github.com/vkurchatkin) - **Vladimir Kurchatkin** <vladimir.kurchatkin@gmail.com>
+* [whitlockjc](https://github.com/whitlockjc) - **Jeremy Whitlock** <jwhitlock@apache.org>
 * [yosuke-furukawa](https://github.com/yosuke-furukawa) - **Yosuke Furukawa** <yosuke.furukawa@gmail.com>
 * [zkat](https://github.com/zkat) - **Kat Marchán** <kzm@sykosomatic.org>