refactor: use es6 features in index file
refactor: use es6 features in index file

driftyco/ionic-native,xueron/ionic-native,ramonornela/ionic-native,ramonornela/ionic-native,ramonornela/ionic-native,xueron/ionic-native,klirix/ionic-native,driftyco/ionic-native,ramonornela/ionic-native,xueron/ionic-native,driftyco/ionic-native,xueron/ionic-native,klirix/ionic-native,klirix/ionic-native