refactor(batterystatus): extract getObservable() from class
refactor(batterystatus): extract getObservable() from class

extracted the getObservable() function from class so it doesn't show as a method (in docs and

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