doc: CONTRIBUTING: adjust copyright
@@ -188,8 +188,7 @@ When you commit your local changes in your repository (before to push to Github)
```
/* Fluent Bit
* ==========
- * Copyright (C) 2019-2020 The Fluent Bit Authors
- * Copyright (C) 2015-2018 Treasure Data Inc.
+ * Copyright (C) 2015-2022 The Fluent Bit Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
