fix issue 60 (#61)
fix issue 60 (#61)


linweigao/react-conf-webrtc,teamious/react-conf-webrtc,teamious/react-conf-webrtc,niuyunsi/react-conf-webrtc,niuyunsi/react-conf-webrtc,asinner/react-conf-webrtc,linweigao/react-conf-webrtc,asinner/react-conf-webrtc