Fix url in changelog

Author: ahangarha

CHANGELOG.md

@@ -17,6 +17,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 The initial release
 
-[unreleased]: https://github.com/dobidi/markdown-it-bidi/compare/v0.2.0...HEAD
+[unreleased]: https://github.com/dobidi/markdown-it-bidi/compare/0.2.0...HEAD
 [0.2.0]: https://github.com/dobidi/markdown-it-bidi/compare/v0.1.0...0.2.0
 [0.1.0]: https://github.com/dobidi/markdown-it-bidi/releases/tag/v0.1.0