@Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        context.startService(new Intent(context, TodayWidgetIntentService.class));
    }
Provider for a horizontally expandable widget showing today's weather.

Delegates widget updating to {@link TodayWidgetIntentService} to ensure that
data retrieval is done on a background thread
app/src/main/java/com/example/android/sunshine/app/widget/TodayWidgetProvider.java