fix changelog

Author: vincentsarago

CHANGES.md

@@ -255,7 +255,8 @@ Note: Minor version `0.X.0` update might break the API, It's recommended to pin
 
 - Initial release
 
-[unreleased]: https://github.com/developmentseed/tipg/compare/0.5.5...HEAD
+[unreleased]: https://github.com/developmentseed/tipg/compare/0.5.6...HEAD
+[0.5.6]: https://github.com/developmentseed/tipg/compare/0.5.5...0.5.6
 [0.5.5]: https://github.com/developmentseed/tipg/compare/0.5.4...0.5.5
 [0.5.4]: https://github.com/developmentseed/tipg/compare/0.5.3...0.5.4
 [0.5.3]: https://github.com/developmentseed/tipg/compare/0.5.2...0.5.3