allow to specify small dot scale

lib/src/effects/scrolling_dots_effect.dart

@@ -18,6 +18,10 @@ class ScrollingDotsEffect extends BasicIndicatorEffect {
   /// active dot scaling
   final double activeDotScale;
 
+  /// [smallDotScale] is multiplied by [dotWidth] to resolve
+  /// side dots
+  final double smallDotScale;
+
   /// The max number of dots to display at a time
   /// if count is <= [maxVisibleDots] [maxVisibleDots] = count
   /// must be an odd number that's >= 5
@@ -30,6 +34,7 @@ class ScrollingDotsEffect extends BasicIndicatorEffect {
   const ScrollingDotsEffect({
     this.activeStrokeWidth = 1.5,
     this.activeDotScale = 1.3,
+    this.smallDotScale = 0.66,
     this.maxVisibleDots = 5,
     this.fixedCenter = false,
     double offset = 16.0,

lib/src/painters/scrolling_dots_painter.dart

@@ -48,7 +48,7 @@ class ScrollingDotsPainter extends BasicIndicatorPainter {
         ? -(firstVisibleDot * distance)
         : -((offset - switchPoint) * distance);
 
-    const smallDotScale = 0.66;
+    final smallDotScale = effect.smallDotScale;
     final activeScale = effect.activeDotScale - 1.0;
     for (var index = firstVisibleDot; index <= lastVisibleDot; index++) {
       var color = effect.dotColor;

lib/src/painters/scrolling_dots_painter_with_fixed_center.dart

@@ -36,7 +36,7 @@ class ScrollingDotsWithFixedCenterPainter extends BasicIndicatorPainter {
       }
 
       var scale = 1.0;
-      const smallDotScale = 0.66;
+      final smallDotScale = effect.smallDotScale;
       final revDotOffset = 1 - dotOffset;
       final switchPoint = (effect.maxVisibleDots - 1) / 2;