Update instancedMesh.ts

Now the InstancedMesh is not animating. To do this, at least you need to add information about the animation. Unfortunately, my knowledge of the engine is superficial. In my case, this code helped me.

src/Meshes/instancedMesh.ts

@@ -52,7 +52,14 @@ export class InstancedMesh extends AbstractMesh {
         if (source.rotationQuaternion) {
             this.rotationQuaternion = source.rotationQuaternion.clone();
         }
-
+        
+        this.animations = source.animations;
+        for (var range of source.getAnimationRanges()) {
+            if (range != null) {
+                this.createAnimationRange(range.name, range.from, range.to);
+            }
+        }
+        
         this.infiniteDistance = source.infiniteDistance;
 
         this.setPivotMatrix(source.getPivotMatrix());