Update CHANGELOG.md

Author: yoshuawuyts

CHANGELOG.md

@@ -284,7 +284,8 @@ Log not kept.
 
 Log not kept.
 
-[Unreleased]: https://github.com/http-rs/tide/compare/0.5.1...HEAD
+[Unreleased]: https://github.com/http-rs/tide/compare/0.6.0...HEAD
+[0.6.0]: https://github.com/http-rs/tide/compare/0.5.1...0.6.0
 [0.5.1]: https://github.com/http-rs/tide/compare/0.5.0...0.5.1
 [0.5.0]: https://github.com/http-rs/tide/compare/0.4.0...0.5.0
 [0.4.0]: https://github.com/http-rs/tide/compare/0.3.0...0.4.0