doc: add richardlau to collaborators

PR-URL: nodejs#12020
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>

Author: richardlau

README.md

@@ -299,6 +299,8 @@ more information about the governance of the Node.js project, see
 **Prince John Wesley** <princejohnwesley@gmail.com>
 * [qard](https://github.com/qard) -
 **Stephen Belanger** <admin@stephenbelanger.com> (he/him)
+* [richardlau](https://github.com/richardlau) -
+**Richard Lau** <riclau@uk.ibm.com>
 * [rlidwka](https://github.com/rlidwka) -
 **Alex Kocharin** <alex@kocharin.ru>
 * [rmg](https://github.com/rmg) -