doc: add bartosz sosnowski to colaborators

Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: João Reis <reis@janeasystems.com>
PR-URL: #7567

Author: bzoz

README.md

@@ -170,6 +170,7 @@ information about the governance of the Node.js project, see
 * [benjamingr](https://github.com/benjamingr) - **Benjamin Gruenbaum** <benjamingr@gmail.com>
 * [bmeck](https://github.com/bmeck) - **Bradley Farias** <bradley.meck@gmail.com>
 * [brendanashworth](https://github.com/brendanashworth) - **Brendan Ashworth** <brendan.ashworth@me.com>
+* [bzoz](https://github.com/bzoz) - **Bartosz Sosnowski** <bartosz@janeasystems.com>
 * [calvinmetcalf](https://github.com/calvinmetcalf) - **Calvin Metcalf** <calvin.metcalf@gmail.com>
 * [claudiorodriguez](https://github.com/claudiorodriguez) - **Claudio Rodriguez** <cjrodr@yahoo.com>
 * [domenic](https://github.com/domenic) - **Domenic Denicola** <d@domenic.me>