Update Changelog.md

Changelog.md

 # Changelog
 
-## [2.5] - 2024-11-21
+## [2.26] - 2024-11-27
+- Rename the `NRENL3CoreService` to `L3CoreService`
+- To the existing Layer 3 core services, add LHCOne, Copernicus and IAS-GWS
+- Add Layer 2 circuit services (GÉANT+ and Azure ExpressRoute)
+- Add a field to BGP sessions for storing prefix limits
+- Update L3 Core service to allow for BFD settings in both a BGP session and the Service Binding Port
+
+## [2.25] - 2024-11-21
 - Updated a trunk description when it is migrated.
 - Made moodi steps indifferent about failure
 - Added a router to Kentik when creating with a PE role