Update CHANGELOG for v1.10.70

***NO_CI***

Author: nfbot

CHANGELOG.md

@@ -1,5 +1,17 @@
 # Changelog
 
+## [**Changes available only in 'Preview' NuGet packages:**](https://github.com/nanoframework/System.Net/tree/HEAD)
+
+[Full Changelog](https://github.com/nanoframework/System.Net/compare/v1.10.68...HEAD)
+
+**Implemented enhancements:**
+
+- Added `==` and `!=` operator overloads to `IpAddress`  [\#310](https://github.com/nanoframework/System.Net/pull/310)
+
+## [v1.10.68](https://github.com/nanoframework/System.Net/tree/v1.10.68) (2024-01-18)
+
+[Full Changelog](https://github.com/nanoframework/System.Net/compare/v1.10.66...v1.10.68)
+
 ## [v1.10.66](https://github.com/nanoframework/System.Net/tree/v1.10.66) (2024-01-16)
 
 [Full Changelog](https://github.com/nanoframework/System.Net/compare/v1.10.64...v1.10.66)