Fix changelog link

Author: taminomara

CHANGELOG.md

@@ -17,6 +17,6 @@
 - Initial release.
 
 [unreleased]: https://github.com/taminomara/sphinx-syntax/compare/v1.0.1...HEAD
-[unreleased]: https://github.com/taminomara/sphinx-syntax/compare/v1.0.0-post1...v1.0.1
+[1.0.1]: https://github.com/taminomara/sphinx-syntax/compare/v1.0.0-post1...v1.0.1
 [1.0.0-post1]: https://github.com/taminomara/sphinx-syntax/compare/v1.0.0...v1.0.0-post1
 [1.0.0]: https://github.com/taminomara/sphinx-syntax/releases/tag/v1.0.0