Update CHANGELOG

Author: kddnewton

CHANGELOG.md

@@ -191,7 +191,8 @@ and it will maintain your formatting.
 
 - Initial release 🎉
 
-[unreleased]: https://github.com/prettier/plugin-xml/compare/v2.1.0...HEAD
+[unreleased]: https://github.com/prettier/plugin-xml/compare/v2.2.0...HEAD
+[2.2.0]: https://github.com/prettier/plugin-xml/compare/v2.1.0...v2.2.0
 [2.1.0]: https://github.com/prettier/plugin-xml/compare/v2.0.1...v2.1.0
 [2.0.1]: https://github.com/prettier/plugin-xml/compare/v2.0.0...v2.0.1
 [2.0.0]: https://github.com/prettier/plugin-xml/compare/v1.2.0...v2.0.0