Animate is not smooth in the final release

## What did you do?

Upgraded Chart to Swift 4.2 version. No code change whatever.

## What did you expect to happen?

scatterView.animate(xAxisDuration: 1.0, yAxisDuration: 0.0) draw smoothly and nice as was appearing in the previous version.

## What happened instead?

scatterView.animate(xAxisDuration: 1.0, yAxisDuration: 0.0) is choppy no matter what the AxisDuration setting.

## Charts Environment

**Charts version/Branch/Commit Number:** Charts 3.2.0
**Xcode version:** Xcode 10.0
**Swift version:** Swift 4.2
**Platform(s) running Charts:** iOS 12.0.1
**macOS version running Xcode:** Mojave 10.14

## Demo Project

```
func updateChartWithVectorData(receivedData: [Float], markerData1: [Int], markerData2: [Int], markerData3: [Int]) {
var dataEntries_a: [ChartDataEntry] = []
for i in 0..Drawing complete!")
}
```

Start by reproducing updateChartWithVectorData, especially the scatterView.animate(xAxisDuration: 1.0, yAxisDuration: 0.0) call, with Charts 3.2.0 on the reported Swift 4.2 and iOS 12 setup. Compare the animation with the previous Charts version and determine whether the choppiness is reproducible; done means the same chart animates smoothly without changing the reported data setup.

Written by the indexing model from the issue text.