Update changelog

Author: christophfriedrich

CHANGELOG.md

@@ -9,7 +9,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
-- Add `id` field to the objects in the array returned by `listFederation` in `Capabilities`
+- New property `id` added to `FederationBackend` objects returned by `listFederation` in `Capabilities`
+- New functions `getFederationBackendById` and `getFederationBackendsByIds` in `Capabilities`
 
 ## [2.7.0] - 2025-01-04