Changelog 8.14.0 (#3294)

* Changelog 8.14.0

* Update CHANGELOG.md

* Update CHANGELOG.md

Author: pmaytak

CHANGELOG.md

@@ -1,5 +1,10 @@
 See the [releases](https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/releases) for details on bug fixes and added features.
 
+8.14.0
+====
+## Bug Fixes
+- Switch back to use `ValidationResult` instead of `OperationResult` when validating a token in a new experimental validation flow. Additionally removed the dependency on Microsoft.IdentityModel.Abstractions. See [#3299](https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/pull/3299) for details.
+
 8.13.1
 ====
 ## Dependencies