Update CHANGELOG for v1.3.15

***NO_CI***

Author: nfbot

CHANGELOG.md

@@ -2,7 +2,15 @@
 
 ## [**Changes available only in 'Preview' NuGet packages:**](https://github.com/nanoframework/System.Device.Spi/tree/HEAD)
 
-[Full Changelog](https://github.com/nanoframework/System.Device.Spi/compare/v1.3.8...HEAD)
+[Full Changelog](https://github.com/nanoframework/System.Device.Spi/compare/v1.3.12...HEAD)
+
+**Documentation and other chores:**
+
+- Update 1 NuGet dependencies [\#92](https://github.com/nanoframework/System.Device.Spi/pull/92)
+
+## [v1.3.12](https://github.com/nanoframework/System.Device.Spi/tree/v1.3.12) (2022-09-13)
+
+[Full Changelog](https://github.com/nanoframework/System.Device.Spi/compare/v1.3.8...v1.3.12)
 
 **Documentation and other chores:**