doc: add qard to collaborators

PR-URL: #578
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Rod Vagg <rod@vagg.org>
Reviewed-By: Chris Dickinson <christopher.s.dickinson@gmail.com>

Author: Qard

README.md

@@ -210,6 +210,7 @@ information about the governance of the io.js project, see
 * **Mikeal Rogers** ([@mikeal](https://github.com/mikeal)) <mikeal.rogers@gmail.com>
 * **Rod Vagg** ([@rvagg](https://github.com/rvagg)) <rod@vagg.org>
 * **Thorsten Lorenz** ([@thlorenz](https://github.com/thlorenz)) <thlorenz@gmx.de>
+* **Stephen Belanger** ([@qard](https://github.com/qard)) <admin@stephenbelanger.com>
 
 Collaborators follow the [COLLABORATOR_GUIDE.md](./COLLABORATOR_GUIDE.md) in
 maintaining the io.js project.