Update Changelog.md

Changelog.md

 # Changelog
 
+## [2.28] - 2024-12-13
+- Fix an issue where LSO could receive special characters from a workflow state.
+- Unify GÉANT service ID resource type naming, and add sequence to the database for generating them.
+- Fix a bug in the Edge Port validation workflow
+- Add support for DCN VLAN numbering in the LAN Switch Interconnect product.
+- Auto-generate IP resources when creating a new LAN Switch Interconnect based on the Site it's in.
+- Update documentation.
+
 ## [2.27] - 2024-12-03
 - Add support for VRFs
 - Rework the way code documentation is built and pulished