Fix changelog.

Author: raldone01

CHANGELOG.md

@@ -47,7 +47,9 @@ Updated dependencies.
 
 Initial release.
 
-[Unreleased]: https://github.com/ink-feather-org/trait-cast-rs/compare/v0.2.4...HEAD
+[Unreleased]: https://github.com/ink-feather-org/trait-cast-rs/compare/v0.3.1...HEAD
+[0.3.1]: https://github.com/ink-feather-org/trait-cast-rs/compare/v0.3.0...v0.3.1
+[0.3.0]: https://github.com/ink-feather-org/trait-cast-rs/compare/v0.2.4...v0.3.0
 [0.2.4]: https://github.com/ink-feather-org/trait-cast-rs/compare/v0.2.3...v0.2.4
 [0.2.3]: https://github.com/ink-feather-org/trait-cast-rs/compare/v0.2.2...v0.2.3
 [0.2.2]: https://github.com/ink-feather-org/trait-cast-rs/compare/v0.2.1...v0.2.2