README: please mention server.listen()

[astro]

I have been wondering for hours why the code from the README (just io.listen) would not open port 8000, only the one for Flashsockets.

[rauchg]

There's a warning in red displayed in master

[astro]

I don't see it.

Why not simply put server.listen() in the example with http.createServer() in the README?