doc: add tunniclm as a collaborator

Refs: #2413
PR-URL: #2826
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>

Author: tunniclm

README.md

@@ -384,6 +384,7 @@ information about the governance of the io.js project, see
 * [thefourtheye](https://github.com/thefourtheye) - **Sakthipriyan Vairamani** <thechargingvolcano@gmail.com>
 * [thlorenz](https://github.com/thlorenz) - **Thorsten Lorenz** <thlorenz@gmx.de>
 * [Trott](https://github.com/Trott) - **Rich Trott** <rtrott@gmail.com>
+* [tunniclm](https://github.com/tunniclm) - **Mike Tunnicliffe** <m.j.tunnicliffe@gmail.com>
 * [vkurchatkin](https://github.com/vkurchatkin) - **Vladimir Kurchatkin** <vladimir.kurchatkin@gmail.com>
 * [yosuke-furukawa](https://github.com/yosuke-furukawa) - **Yosuke Furukawa** <yosuke.furukawa@gmail.com>