doc: use my legal name in README

Just so that it's documented. Feel free to call me anything you want
though: Timothy, Tim, 顾天骋.

PR-URL: https://github.com/nodejs/node/pull/17894


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>