title: How to draw LineChartData in swift 3?
body: <p>I switched to swift 3 and I am now struggling to get my chart data shown again. When I use it like that, I just see an empty chart.
  I think some initializers changed?</p>
  
  <p>I am using the Swift-3.0 branch.   </p>
  
  <pre><code>@IBOutlet weak var lineChartView: LineChartView!
  
  override func viewDidLoad() {
  
    for x in data {
      ...
      let dataSet = LineChartDataSet(yVals: dataEntries, label: player.getName())
      lineChartData.addDataSet(dataSet)
    }
  
    lineChartView.data = lineChartData
  }
  </code></pre>