fix(plugin): adds subscribe() and unsubscribe()
fix(plugin): adds subscribe() and unsubscribe()

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