Add breaking changes

Author: msujew

packages/langium/CHANGELOG.md

@@ -9,13 +9,20 @@
 * Improve unknown file type handling in the language server ([#1455](https://github.com/eclipse-langium/langium/pull/1455), [#1492](https://github.com/eclipse-langium/langium/pull/1492)).
 * Emit an event after configuration section updates ([#1445](https://github.com/eclipse-langium/langium/pull/1445)).
 * Deleted files now have their diagnostics removed ([#1441](https://github.com/eclipse-langium/langium/pull/1441)).
+* The parser can now start with an alternative entry rule ([#1407](https://github.com/eclipse-langium/langium/pull/1407)).
 
 ### Bug Fixes
 
 * Fixed cyclic formatter behavior ([#1550](https://github.com/eclipse-langium/langium/pull/1550)).
 * Fixed incorrect CST nodes after performing grammar actions ([#1547](https://github.com/eclipse-langium/langium/pull/1547)).
 * Fixed a few `Stream` idempotency issues ([#1545](https://github.com/eclipse-langium/langium/pull/1545)).
 
+### Breaking Changes
+
+* The `ConfigurationProvider` interface needs to implement the `onConfigurationSectionUpdate` method ([#1445](https://github.com/eclipse-langium/langium/pull/1445)).
+* The `ServiceRegistry` interface needs to implement the new `hasServices` method ([#1455](https://github.com/eclipse-langium/langium/pull/1455)).
+* The `DefaultServiceRegistry#map` field has been deprecated. Please use the new `fileExtensionMap` field (together with `languageIdMap` instead).
+
 ## v3.0.0 (Feb. 2024)
 
 ### Smaller Bundles with Exports