Update CHANGELOG for v1.0.3

***NO_CI***

Author: nfbot

CHANGELOG.md

@@ -2,7 +2,15 @@
 
 ## [**Changes available only in 'Preview' NuGet packages:**](https://github.com/nanoframework/System.Device.Gpio/tree/HEAD)
 
-[Full Changelog](https://github.com/nanoframework/System.Device.Gpio/compare/v1.0.3-preview.3...HEAD)
+[Full Changelog](https://github.com/nanoframework/System.Device.Gpio/compare/v1.0.3-preview.6...HEAD)
+
+**Documentation and other chores:**
+
+- Update 2 NuGet dependencies [\#45](https://github.com/nanoframework/System.Device.Gpio/pull/45)
+
+## [v1.0.3-preview.6](https://github.com/nanoframework/System.Device.Gpio/tree/v1.0.3-preview.6) (2022-01-21)
+
+[Full Changelog](https://github.com/nanoframework/System.Device.Gpio/compare/v1.0.3-preview.3...v1.0.3-preview.6)
 
 **Documentation and other chores:**