Fix highlight arrow animation phaseY

Author: danielgindi

Charts/Classes/Renderers/BarChartRenderer.swift

@@ -543,7 +543,7 @@ public class BarChartRenderer: ChartDataRendererBase
                     let arrowWidth = set.barSpace / 2.0
                     let arrowHeight = arrowWidth * xToYRel
 
-                    let yArrow = y1 > -y2 ? y1 : y1;
+                    let yArrow = (y1 > -y2 ? y1 : y1) * Double(_animator.phaseY)
 
                     _highlightArrowPtsBuffer[0].x = CGFloat(x) + 0.4
                     _highlightArrowPtsBuffer[0].y = CGFloat(yArrow) + offsetY