title: Charts lineChartDataset rounded values
body: <p>I'm trying out a few things with the iOS Charts library with Swift 3.0.
  I have a question about formatting of the lineChartDataset values (displayed above each value point). Right now these values are 'double' and are displayed as 2.0 and 3.0 instead of just 2 and 3 etc. Is it possible to round these values? I tried with numberFormatter but nothing works. Any help would be appreciated.</p>