doc: add domenic as collaborator

PR-URL: #1942
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

Author: domenic

README.md

@@ -302,6 +302,7 @@ information about the governance of the io.js project, see
 * **Christopher Monsanto** ([@monsanto](https://github.com/monsanto)) <chris@monsan.to>
 * **Ali Ijaz Sheikh** ([@ofrobots](https://github.com/ofrobots)) <ofrobots@google.com>
 * **Oleg Elifantiev** ([@Olegas](https://github.com/Olegas)) <oleg@elifantiev.ru>
+* **Domenic Denicola** ([@domenic](https://github.com/domenic)) <d@domenic.me>
 
 Collaborators follow the [COLLABORATOR_GUIDE.md](./COLLABORATOR_GUIDE.md) in
 maintaining the io.js project.