BarChart bottom space when having a small value

[nastasiupta]

[*] I've read, understood, and done my best to follow the *CONTRIBUTING guidelines.

What did you do?

I just configured BarChartView with basic data as following:

` var dataEntries: [BarChartDataEntry] = []

    let values: [Double] = [50.0, 100.0, 123.0, 313.0, 104.0, 180.0]
    for i in 0 ..< values.count {
        let dataEntry = BarChartDataEntry(x: Double(i), y: Double(values[i]))
        dataEntries.append(dataEntry)
    }
    
    let chartDataSet = BarChartDataSet(entries: dataEntries)
    chartDataSet.colors = [UIColor(red: 55.0/255.0, green: 148.0/255.0, blue: 252.0/255.0, alpha: 1.0)]
    let chartData = BarChartData(dataSet: chartDataSet)
    barChartView?.xAxis.labelPosition = .bottom
    barChartView?.xAxis.valueFormatter = axisFormatDelegate
    barChartView?.xAxis.labelTextColor = Color.main.color
    barChartView?.xAxis.labelFont = AppFonts.regular.font.withSize(7)
    barChartView?.xAxis.gridColor = UIColor(red: 224.0/255.0, green: 231.0/255.0, blue: 255.0/255.0, alpha: 1.0)
    barChartView?.leftAxis.labelTextColor = Color.main.color
    barChartView?.leftAxis.labelFont = AppFonts.regular.font.withSize(9)
    barChartView?.leftAxis.gridColor = UIColor(red: 224.0/255.0, green: 231.0/255.0, blue: 255.0/255.0, alpha: 1.0)
    barChartView?.rightAxis.enabled = false
    barChartView?.legend.enabled = false
    barChartView?.data = chartData
    barChartView?.isUserInteractionEnabled = false`

What did you expect to happen?

To see the chart but having the BarChart starting from XAxis

What happened instead?

I have a some space on the bottom

But if I try with bigger values, it works properly:

Charts Environment

Charts version/Branch/Commit Number: 3.4.0
Xcode version: 11.1 (11A1027)
Swift version: 5.0
Platform(s) running Charts: iPhone X iOS 13.1
macOS version running Xcode: macOS Catalina 10.15

[liuxuan30]

set axis min.