util: parse facingMode in mergeMediaConstraints()
util: parse facingMode in mergeMediaConstraints()

zxcpoiu/react-native-webrtc,zxcpoiu/react-native-webrtc,zxcpoiu/react-native-webrtc,zxcpoiu/react-native-webrtc,zxcpoiu/react-native-webrtc,zxcpoiu/react-native-webrtc