Update MemberRef.java

maxkey-identitys/maxkey-identity-scim/src/main/java/org/maxkey/identity/scim/resources/MemberRef.java

@@ -2,4 +2,9 @@ package org.maxkey.identity.scim.resources;
 
 public class MemberRef extends MultiValuedAttribute{
 
+    /**
+     * 
+     */
+    private static final long serialVersionUID = -6018893424394625889L;
+
 }