With Livestream Alerts, you can track subscribers, and there's even support for textfile output. Use Livestream Alerts Counters instead.
This page is a quick wrapper around Bloocifer's sub counter; If you were using
http://bloocifer.com/subgoal.html you can just replace the "bloocifer.com" with "chrisplaysgames.com" (I think). Otherwise, you can set up a new sub goal below.