doc: add thefourtheye as a collaborator

Refer: https://github.com/nodejs/io.js/issues/2102

PR-URL: https://github.com/nodejs/io.js/pull/2199
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>

README.md

@@ -360,6 +360,7 @@ information about the governance of the io.js project, see
 * **Domenic Denicola** <d@domenic.me> ([@domenic](https://github.com/domenic))
 * **Rich Trott** <rtrott@gmail.com> ([@Trott](https://github.com/Trott))
 * **Сковорода Никита Андреевич** <chalkerx@gmail.com> ([@ChALkeR](https://github.com/ChALkeR))
+* **Sakthipriyan Vairamani** <thechargingvolcano@gmail.com> ([@thefourtheye](https://github.com/thefourtheye))
 
 Collaborators & TSC members follow the [COLLABORATOR_GUIDE.md](./COLLABORATOR_GUIDE.md) in
 maintaining the io.js project.