Docs: Changelog. [skip ci]

CHANGELOG.md

@@ -1,6 +1,17 @@
 Changelog
 =========
 
+## [5.0.0](https://github.com/ckeditor/ckeditor5-react/compare/v4.0.1...v5.0.0) (2022-04-12)
+
+### BREAKING CHANGES
+
+* Due to introducing the lock mechanism for the `Editor#isReadOnly` property, the `<CKEditor>` component uses the new way of enabling the read-only mode in the editor. The component requires an instance of CKEditor 5 in version 34 or higher. See [ckeditor/ckeditor5#10496](https://github.com/ckeditor/ckeditor5/issues/10496).
+
+### Other changes
+
+* Aligned the `<CKEditor>` component API to use the new lock mechanism when enabling/disabling the read-only mode. ([commit](https://github.com/ckeditor/ckeditor5-react/commit/df734432610aef9483bd676a0445fe7c3f662cf8))
+
+
 ## [4.0.1](https://github.com/ckeditor/ckeditor5-react/compare/v4.0.0...v4.0.1) (2022-04-01)
 
 ### Other changes