doc: add gibfahn to collaborators

PR-URL: #8533
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Johan Bergström <bugs@bergstroem.nu>

Author: gibfahn

README.md

@@ -229,6 +229,8 @@ more information about the governance of the Node.js project, see
 **Daniel Wang** <wangyang0123@gmail.com>
 * [geek](https://github.com/geek) -
 **Wyatt Preul** <wpreul@gmail.com>
+* [gibfahn](https://github.com/gibfahn) -
+**Gibson Fahnestock** <gibfahn@gmail.com>
 * [iarna](https://github.com/iarna) -
 **Rebecca Turner** <me@re-becca.org>
 * [imyller](https://github.com/imyller) -