title: fatalError("init(coder:) has not been implemented") in AACHART
body: <p>Hello I am using this pod
  <a href="https://github.com/AAChartModel/AAChartKit-Swift" rel="nofollow noreferrer">https://github.com/AAChartModel/AAChartKit-Swift</a>
  in this pod I am using my own UIView and set class <code>AAChartView</code>
  and setup in my <code>viewDidLoad</code> I am calling this function and getting error</p>
  
  <blockquote>
    <p>fatalError("init(coder:) has not been implemented")</p>
  </blockquote>
  
  <pre><code>func setUpAAChartView() {
  
      aaChartModel = AAChartModel()
          .chartType(.line)//Can be any of the chart types listed under `AAChartType`.
          .animationType(.bounce)
          .title("TITLE")//The chart title
          .subtitle("subtitle")//The chart subtitle
          .dataLabelEnabled(false) //Enable or disable the data labels. Defaults to false
          .tooltipValueSuffix("USD")//the value suffix of the chart tooltip
          .categories(["Jan", "Feb", "Mar", "Apr", "May", "Jun",
                       "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"])
          .colorsTheme(["#fe117c","#ffc069","#06caf4","#7dffc0"])
          .series([
              AASeriesElement()
                  .name("Tokyo")
                  .data([7.0, 6.9, 9.5, 14.5, 18.2, 21.5, 25.2, 26.5, 23.3, 18.3, 13.9, 9.6])
                  .toDic()!,
              AASeriesElement()
                  .name("New York")
                  .data([0.2, 0.8, 5.7, 11.3, 17.0, 22.0, 24.8, 24.1, 20.1, 14.1, 8.6, 2.5])
                  .toDic()!,
              AASeriesElement()
                  .name("Berlin")
                  .data([0.9, 0.6, 3.5, 8.4, 13.5, 17.0, 18.6, 17.9, 14.3, 9.0, 3.9, 1.0])
                  .toDic()!,
              AASeriesElement()
                  .name("London")
                  .data([3.9, 4.2, 5.7, 8.5, 11.9, 15.2, 17.0, 16.6, 14.2, 10.3, 6.6, 4.8])
                  .toDic()!,])
  
      aaChartView?.aa_drawChartWithChartModel(aaChartModel!)
  
  }
  </code></pre>