release 3.1.0
release 3.1.0

a76c8ba android: start proximity sensor anyway  ( zxcpoiu 2018-01-26 17:26:45 +0800)
b63414b android: fix broken forceSpeakerOn  ( zxcpoiu 2018-01-25 20:26:51 +0800)

zxcpoiu/react-native-incall-manager,zxcpoiu/react-native-incall-manager,zxcpoiu/react-native-incall-manager