Update CHANGELOG for v1.4.3.3

***NO_CI***

Author: nfbot

CHANGELOG.md

@@ -1,6 +1,16 @@
 # Changelog
 
-[Full Changelog](https://github.com/nanoframework/System.Math/compare/v1.4.3-preview.18...HEAD)
+## [v1.4.3](https://github.com/nanoframework/System.Math/tree/v1.4.3) (2021-12-02)
+
+[Full Changelog](https://github.com/nanoframework/System.Math/compare/v1.4.3-preview.20...v1.4.3)
+
+**Documentation and other chores:**
+
+- Update 1 nuget dependencies [\#91](https://github.com/nanoframework/System.Math/pull/91)
+
+## [v1.4.3-preview.20](https://github.com/nanoframework/System.Math/tree/v1.4.3-preview.20) (2021-12-02)
+
+[Full Changelog](https://github.com/nanoframework/System.Math/compare/v1.4.3-preview.18...v1.4.3-preview.20)
 
 **Documentation and other chores:**