Added backAndroidHandler to routerProps typings (#1586)
Added backAndroidHandler to routerProps typings (#1586)


dmazin/react-native-router-flux,mcabs3/react-native-router-flux,mcabs3/react-native-router-flux,aksonov/react-native-router-flux,gijoehosaphat/react-native-router-flux,mcabs3/react-native-router-flux,charpeni/react-native-router-flux,gijoehosaphat/react-native-router-flux,charpeni/react-native-router-flux,gijoehosaphat/react-native-router-flux,charpeni/react-native-router-flux,dmazin/react-native-router-flux,dmazin/react-native-router-flux