doc: adding sebdeckers to collaborators

PR-URL: #15354
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>

Author: sebdeckers

README.md

@@ -468,6 +468,8 @@ For more information about the governance of the Node.js project, see
 **Sam Roberts** <vieuxtech@gmail.com>
 * [santigimeno](https://github.com/santigimeno) -
 **Santiago Gimeno** <santiago.gimeno@gmail.com>
+* [sebdeckers](https://github.com/sebdeckers) -
+**Sebastiaan Deckers** <sebdeckers83@gmail.com>
 * [seishun](https://github.com/seishun) -
 **Nikolai Vavilov** <vvnicholas@gmail.com>
 * [shigeki](https://github.com/shigeki) -