Update CHANGELOG for v1.0.0

***NO_CI***

Author: nfbot

CHANGELOG.md

@@ -1,5 +1,17 @@
 # Changelog
 
+## [**Changes available only in 'Preview' NuGet packages:**](https://github.com/nanoframework/nanoFramework.M5Stack/tree/HEAD)
+
+[Full Changelog](https://github.com/nanoframework/nanoFramework.M5Stack/compare/v1.0.0-preview.49...HEAD)
+
+**Documentation and other chores:**
+
+- Update 2 nuget dependencies [\#20](https://github.com/nanoframework/nanoFramework.M5Stack/pull/20)
+
+## [v1.0.0-preview.49](https://github.com/nanoframework/nanoFramework.M5Stack/tree/v1.0.0-preview.49) (2021-06-01)
+
+[Full Changelog](https://github.com/nanoframework/nanoFramework.M5Stack/compare/v1.0.0-preview.47...v1.0.0-preview.49)
+
 ## [v1.0.0-preview.47](https://github.com/nanoframework/nanoFramework.M5Stack/tree/v1.0.0-preview.47) (2021-06-01)
 
 [Full Changelog](https://github.com/nanoframework/nanoFramework.M5Stack/compare/v1.0.0-preview.46...v1.0.0-preview.47)