Remove trailing commas to make it work on 2.11 again

Author: sbrunk

core/shared/src/main/scala/plotly/layout/Axis.scala

@@ -75,8 +75,7 @@ object Axis {
           tickvals: Sequence         = null,
           ticktext: Sequence         = null,
             nticks: JInt             = null,
-        automargin: JBoolean         = null,
-
+        automargin: JBoolean         = null
   ): Axis =
     Axis(
       Option(title),

core/shared/src/main/scala/plotly/layout/Margin.scala

@@ -9,7 +9,7 @@ final case class Margin(
            r: Option[Int],
            t: Option[Int],
            b: Option[Int],
-         pad: Option[Int],
+         pad: Option[Int]
 )
 
 object Margin {