Update CHANGELOG for v1.1.1

***NO_CI***

Author: nfbot

CHANGELOG.md

@@ -1,5 +1,13 @@
 # Change Log
 
+## [**Changes available only in 'Preview' NuGet packages:**](https://github.com/nanoframework/lib-nanoFramework.System.Net/tree/HEAD)
+
+[Full Changelog](https://github.com/nanoframework/lib-nanoFramework.System.Net/compare/v1.1.1-preview.1...HEAD)
+
+**Documentation and other chores:**
+
+- Update 2 NuGet dependencies [\#81](https://github.com/nanoframework/lib-nanoFramework.System.Net/pull/81)
+
 ## [v1.1.1-preview.1](https://github.com/nanoframework/lib-nanoFramework.System.Net/tree/v1.1.1-preview.1) (2019-06-05)
 [Full Changelog](https://github.com/nanoframework/lib-nanoFramework.System.Net/compare/v1.1.0-preview.1...v1.1.1-preview.1)