doc: add Sam Roberts to TSC

Voted on async in the TSC repo.
This adds him to the TSC list in the README.

Fixes: nodejs/TSC#687

README.md

@@ -197,6 +197,8 @@ For information about the governance of the Node.js project, see
 **Myles Borins** <myles.borins@gmail.com> (he/him)
 * [rvagg](https://github.com/rvagg) -
 **Rod Vagg** <rod@vagg.org>
+* [sam-github](https://github.com/sam-github) -
+**Sam Roberts** <vieuxtech@gmail.com>
 * [targos](https://github.com/targos) -
 **Michaël Zasso** <targos@protonmail.com> (he/him)
 * [thefourtheye](https://github.com/thefourtheye) -