doc: add @othiym23 to list of collaborators

Forrest Norvell (that's me!) has been a collaborator since roughly April
2015. I thought I'd added myself to the list of collaborators, but
apparently hadn't. I was onboarded by @chrisdickinson as part of the
second or third group of collaborators added to the project.

PR-URL: #6945
Reviewed-By: Chris Dickinson <christopher.s.dickinson@gmail.com>

Author: othiym23

README.md

@@ -190,6 +190,7 @@ information about the governance of the Node.js project, see
 * [mikeal](https://github.com/mikeal) - **Mikeal Rogers** <mikeal.rogers@gmail.com>
 * [monsanto](https://github.com/monsanto) - **Christopher Monsanto** <chris@monsan.to>
 * [Olegas](https://github.com/Olegas) - **Oleg Elifantiev** <oleg@elifantiev.ru>
+* [othiym23](https://github.com/othiym23) - **Forrest L Norvell** <ogd@aoaioxxysz.net>
 * [petkaantonov](https://github.com/petkaantonov) - **Petka Antonov** <petka_antonov@hotmail.com>
 * [phillipj](https://github.com/phillipj) - **Phillip Johnsen** <johphi@gmail.com>
 * [pmq20](https://github.com/pmq20) - **Minqi Pan** <pmq2001@gmail.com>