fix changelog ureleased link

Author: outdead

CHANGELOG.md

@@ -35,7 +35,7 @@ job was joined with tests workflow.
 ### Added
 - Initial implementation.
 
-[Unreleased]: https://github.com/gorcon/websocket/compare/v1.0.1...HEAD
+[Unreleased]: https://github.com/gorcon/websocket/compare/v1.1.1...HEAD
 [v1.1.1]: https://github.com/gorcon/websocket/compare/v1.1.0...v1.1.1
 [v1.1.0]: https://github.com/gorcon/websocket/compare/v1.0.1...v1.1.0
 [v1.0.1]: https://github.com/gorcon/websocket/compare/v1.0.0...v1.0.1