docs(CHANGELOG): prepare for 7.2.1 release
docs(CHANGELOG): prepare for 7.2.1 release

rebeccahughes/react-native-device-info,rebeccahughes/react-native-device-info,rebeccahughes/react-native-device-info,rebeccahughes/react-native-device-info,rebeccahughes/react-native-device-info,rebeccahughes/react-native-device-info