update HDAdditionalReflectionData version handling

com.unity.render-pipelines.high-definition/HDRP/Lighting/Reflection/HDAdditionalReflectionData.cs

 using UnityEngine.Serialization;
 using UnityEngine.Experimental.Rendering.HDPipeline;
+using System;
-    public class HDAdditionalReflectionData : MonoBehaviour
+    public class HDAdditionalReflectionData : MonoBehaviour, ISerializationCallbackReceiver
-        public float version = 1.0f;
+        const int currentVersion = 1;
+
+        [SerializeField, FormerlySerializedAs("version")]
+        int m_Version;
 
         public ShapeType influenceShape;
         [FormerlySerializedAsAttribute("dimmer")]
 
         public float sphereBlendRadiusOffset { get { return -blendDistancePositive.x; } }
         public float sphereBlendNormalRadiusOffset { get { return -blendNormalDistancePositive.x; } }
+
+        public void OnBeforeSerialize()
+        {
+        }
+
+        public void OnAfterDeserialize()
+        {
+            if (m_Version != currentVersion)
+            {
+                // Add here data migration code
+                m_Version = currentVersion;
+            }
+        }
     }
 }