doc: add gabrielschulhof to collaborators

PR-URL: #14692
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: Gabriel Schulhof

README.md

@@ -296,6 +296,8 @@ more information about the governance of the Node.js project, see
 **Daniel Wang** <wangyang0123@gmail.com>
 * [Fishrock123](https://github.com/Fishrock123) -
 **Jeremiah Senkpiel** <fishrock123@rocketmail.com>
+* [gabrielschulhof](https://github.com/gabrielschulhof) -
+**Gabriel Schulhof** <gabriel.schulhof@intel.com>
 * [geek](https://github.com/geek) -
 **Wyatt Preul** <wpreul@gmail.com>
 * [gibfahn](https://github.com/gibfahn) -