updated readme

Author: Ilya Sakovich

README.md

@@ -40,3 +40,4 @@ php artisan nova-lang:publish de,ru --force
 - **pl** - incompleted, need review
 - **zh-CN** - completed, thanks to [jcc](https://github.com/jcc)!
 - **ro** - completed, thanks to [BTeodorWork](https://github.com/BTeodorWork)!
+- **cn** - completed, thanks to [Pierolin](https://github.com/Pierolin)!