doc: add hashseed to collaborators

PR-URL: #16863
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

Author: hashseed

README.md

@@ -364,6 +364,8 @@ For more information about the governance of the Node.js project, see
 **Gibson Fahnestock** <gibfahn@gmail.com> (he/him)
 * [gireeshpunathil](https://github.com/gireeshpunathil) -
 **Gireesh Punathil** <gpunathi@in.ibm.com> (he/him)
+* [hashseed](https://github.com/hashseed) -
+**Yang Guo** <yangguo@chromium.org> (he/him)
 * [iarna](https://github.com/iarna) -
 **Rebecca Turner** <me@re-becca.org>
 * [imran-iq](https://github.com/imran-iq) -