Spatial Mapping Readme updated test links

Author: StephenHodgson

Assets/HoloToolkit/SpatialMapping/README.md

@@ -159,7 +159,7 @@ A basic wire frame shader that can be used for rendering spatial mapping meshes.
 #### SpatialMappingTap.shader
 Draws a ring originating from a location in space. Useful for showing where a user tapped. Requires a component to drive it's radius and set the tap location in world space.
 
-### [Tests Scenes](Tests/Scenes)
+### [Tests Scenes](https://github.com/Microsoft/HoloToolkit-Unity/tree/master/Assets/HoloToolkit-Tests/SpatialMapping/Scenes)
 
 #### PlaneFinding.unity
 To use this sample code, load the PlaneFinding scene and hit Play. The PlaneFinding algorithm will run in a loop. Switch to the scene view to see a visualization of the planes found.