title: Bar chart is giving negative values
body: <p>I am using Charts API and implementing chart. I am new in that and there is no proper documentation for Swift 3.</p>
  
  <p>I tried and implemented but don't know how to remove that negative scale for y. How can I start my graph from 0 only, so it does not show a negative y scale? </p>
  
  <p>Below is my code:</p>
  
  <pre><code>fileprivate func ChartViewProperty() {
  
      barChartView.xAxis.labelPosition = .bottom
      barChartView.chartDescription?.text = ""
      barChartView.fitBars = true
      barChartView.pinchZoomEnabled = false
      self.barChartView.rightAxis.enabled = false
      barChartView.animate(xAxisDuration: 2.0, yAxisDuration: 2.0)
      barChartView.animate(xAxisDuration: 2.0, yAxisDuration: 2.0, easingOption: .easeInBounce)
  
      barChartView.xAxis.valueFormatter = IndexAxisValueFormatter(values:months)
      barChartView.xAxis.granularity = 1
      value.append([jan,feb,mar,apr,may,jun,jly,aug,sep,oct,nov,dec])
      setChart(dataPoints: months, values: value)
  }. 
  </code></pre>
  
  <p>Image:</p>
  
  <p><a href="https://i.stack.imgur.com/ROh7b.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ROh7b.png" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/bLU2D.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/bLU2D.png" alt="enter image description here"></a></p>