Fixed README.textile
Fixed README.textile

Usage API v1 changed 154256550d0f539aea4a10b4c668c537c9f31f5b use `@api.bool_val`
banrui/hipchat-rb,bonusly/hipchat-rb,scalixte-mdsol/hipchat-rb,ph/hipchat-rb,onthespotqa/hipchat-rb,bonusly/hipchat-rb,hipchat/hipchat-rb,hipchat/hipchat-rb,StatusPage/hipchat-rb