follow twitch live stream change

[t0yohei]

resolve #10

The markup structure on live streaming was changed by twitch update. With this patch, we can follow the update.

[wheatup]

Oops sorry I forgot to check PRs before trying to fix this issue. I think the problem has been solved right now(also tidied my code a little bit).

[t0yohei]

Nice fix! Thank you.