Update CHANGELOG for v1.5.3

***NO_CI***

Author: nfbot

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## [v1.5.3-preview.4](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/tree/v1.5.3-preview.4) (2020-12-17)
+
+[Full Changelog](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/compare/v1.5.2-preview.19...v1.5.3-preview.4)
+
 ## [v1.5.2-preview.19](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/tree/v1.5.2-preview.19) (2020-12-07)
 
 [Full Changelog](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/compare/v1.5.2-preview.16...v1.5.2-preview.19)