Update CHANGELOG for v1.0.3

***NO_CI***

Author: nfbot

CHANGELOG.md

@@ -1,8 +1,8 @@
 # Changelog
 
-## [**Changes available only in 'Preview' NuGet packages:**](https://github.com/nanoframework/System.IO.FileSystem/tree/HEAD)
+## [v1.0.3-preview.9](https://github.com/nanoframework/System.IO.FileSystem/tree/v1.0.3-preview.9) (2022-02-04)
 
-[Full Changelog](https://github.com/nanoframework/System.IO.FileSystem/compare/v1.0.3-preview.7...HEAD)
+[Full Changelog](https://github.com/nanoframework/System.IO.FileSystem/compare/v1.0.3-preview.7...v1.0.3-preview.9)
 
 **Documentation and other chores:**