doc: add rubys to collaborators

PR-URL: #22109
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Bryan English <bryan@bryanenglish.com>

Author: rubys

README.md

@@ -471,6 +471,8 @@ For more information about the governance of the Node.js project, see
 **Ron Korving** <ron@ronkorving.nl>
 * [RReverser](https://github.com/RReverser) -
 **Ingvar Stepanyan** <me@rreverser.com>
+* [rubys](https://github.com/rubys) -
+**Sam Ruby** <rubys@intertwingly.net>
 * [rvagg](https://github.com/rvagg) -
 **Rod Vagg** <rod@vagg.org>
 * [ryzokuken](https://github.com/ryzokuken) -