Update overview.md

docs/animation/overview.md

@@ -8,10 +8,11 @@ permalink: /animation/
 
 There are four primary components that must be implemented to support Animation functionality.
 
+##A4.0
 - [(Task 1) Spline Interpolation](camera_rays.md)
 - [(Task 2) Skeleton Kinematics](intersecting_objects.md)
-- [(Task 3) Linear Blend Skinning]()
-- [(Task 4) Physical Simulation]()
+##A4.5
+- Soon to come
 
 Each of these components is described at the linked page.