chore: add missing copyright header to version_info file

Author: JKRhb

lib/src/definitions/version_info.dart

@@ -1,3 +1,9 @@
+// Copyright 2022 Contributors to the Eclipse Foundation. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+//
+// SPDX-License-Identifier: BSD-3-Clause
+
 import "package:curie/curie.dart";
 
 import "extensions/json_parser.dart";