Update CHANGELOG for v1.5.3

***NO_CI***

Author: nfbot

CHANGELOG.md

@@ -1,5 +1,17 @@
 # Changelog
 
+## [**Changes available only in 'Preview' NuGet packages:**](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/tree/HEAD)
+
+[Full Changelog](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/compare/v1.5.3-preview.20...HEAD)
+
+**Documentation and other chores:**
+
+- Bumps nanoFramework.CoreLibrary from 1.10.1-preview.11 to 1.10.3-preview.7 [\#94](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/pull/94)
+
+## [v1.5.3-preview.20](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/tree/v1.5.3-preview.20) (2021-03-21)
+
+[Full Changelog](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/compare/v1.5.3-preview.19.ga29c9d0cfe...v1.5.3-preview.20)
+
 ## [v1.5.3-preview.19.ga29c9d0cfe](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/tree/v1.5.3-preview.19.ga29c9d0cfe) (2021-03-21)
 
 [Full Changelog](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/compare/v1.5.3-preview.18...v1.5.3-preview.19.ga29c9d0cfe)
@@ -376,6 +388,7 @@
 **Documentation and other chores:**
 
 - Bumps nanoFramework.CoreLibrary from 1.0.6-preview-021 to 1.1.0 [\#27](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/pull/27)
+- Bumps nanoFramework.CoreLibrary from 1.0.6-preview-010 to 1.0.6-preview-021 [\#26](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/pull/26)
 
 ## [v1.0.2-preview-049](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/tree/v1.0.2-preview-049) (2018-11-27)
 
@@ -431,24 +444,23 @@
 
 ## [v1.0.2-preview-002](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/tree/v1.0.2-preview-002) (2018-11-06)
 
-[Full Changelog](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/compare/v1.0.2-preview-036...v1.0.2-preview-002)
+[Full Changelog](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/compare/v1.0.2-preview-032...v1.0.2-preview-002)
 
 **Documentation and other chores:**
 
-- Bumps nanoFramework.CoreLibrary from 1.0.6-preview-010 to 1.0.6-preview-021 [\#26](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/pull/26)
 - Bumps nanoFramework.CoreLibrary from 1.0.4 to 1.0.5-preview024 [\#16](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/pull/16)
 
-## [v1.0.2-preview-036](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/tree/v1.0.2-preview-036) (2018-10-17)
-
-[Full Changelog](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/compare/v1.0.2-preview-032...v1.0.2-preview-036)
-
 ## [v1.0.2-preview-032](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/tree/v1.0.2-preview-032) (2018-10-17)
 
 [Full Changelog](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/compare/v1.0.2-preview-033...v1.0.2-preview-032)
 
 ## [v1.0.2-preview-033](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/tree/v1.0.2-preview-033) (2018-10-17)
 
-[Full Changelog](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/compare/v1.0.0...v1.0.2-preview-033)
+[Full Changelog](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/compare/v1.0.2-preview-036...v1.0.2-preview-033)
+
+## [v1.0.2-preview-036](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/tree/v1.0.2-preview-036) (2018-10-17)
+
+[Full Changelog](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/compare/v1.0.0...v1.0.2-preview-036)
 
 ## [v1.0.0](https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp/tree/v1.0.0) (2018-10-17)