Add missing copyright to a test file

test/utf8/unicode_sequence_serialized.js

@@ -1,3 +1,8 @@
+//-------------------------------------------------------------------------------------------------------
+// Copyright (C) Microsoft Corporation and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
+//-------------------------------------------------------------------------------------------------------
+
 (function () {
        /(오)/ ;
 })();