Update AABoxplot.swift

Author: AAChartModel

AAInfographics/AAOptionsModel/AABoxplot.swift

@@ -48,7 +48,6 @@ public class AABoxplot: AAObject {
     public var whiskerDashStyle: String?
     public var whiskerLength: Any?
     public var whiskerWidth: Float?
-    public var grouping: Bool?
     public var pointPadding: Float?
     public var pointWidth: Float?
 
@@ -148,12 +147,6 @@ public class AABoxplot: AAObject {
         return self
     }
 
-    @discardableResult
-    public func grouping(_ prop: Bool?) -> AABoxplot {
-        grouping = prop
-        return self
-    }
-    
     @discardableResult
     public func pointPadding(_ prop: Float?) -> AABoxplot {
         pointPadding = prop