Added dependency for versions of Node.js before 0.9.3

I tested this module with `0.9.2` of Node.js and the `ondata` does not match the Socket wanting to use `socket.on('data', .....` so it doesn't work. I already re-wrote it as a new module (`proxysocket`) but wanted to let others know this module won't work for newer versions of Node.js currently.

Thanks,
Kris