docs(README): update copyright date (zenika-open-source#290)

Author: arthurzenika

README.md

@@ -59,7 +59,7 @@ https://theduckgallery.zenika.com
 ## License
 
 This project is [Apache-2.0](./LICENSE.md) licensed.<br />
-Copyright © 2020 [Zenika](https://oss.zenika.com).
+Copyright © 2020-2022 [Zenika](https://oss.zenika.com).
 
 
 ![with love by zenika](https://img.shields.io/badge/With%20%E2%9D%A4%EF%B8%8F%20by-Zenika-b51432.svg?link=https://oss.zenika.com)