release 1.2.1
release 1.2.1

552c292 Update README.md
d2b100a ios: add WiredHeadset event
9fb0520 Update README.md
d562f4b Update README.md

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