fix changelog

Author: eguzki

CHANGELOG.md

@@ -331,7 +331,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 - `3scale copy service` command to copy a service
   including its metrics, methods, application plans and their usage limits
 
-[Unreleased]: https://github.com/3scale/3scale_toolbox/compare/v0.20.0...HEAD
+[Unreleased]: https://github.com/3scale/3scale_toolbox/compare/v1.0.0...HEAD
+[1.0.0]: https://github.com/3scale/3scale_toolbox/releases/tag/v1.0.0
 [0.20.0]: https://github.com/3scale/3scale_toolbox/releases/tag/v0.20.0
 [0.19.3]: https://github.com/3scale/3scale_toolbox/releases/tag/v0.19.3
 [0.19.2]: https://github.com/3scale/3scale_toolbox/releases/tag/v0.19.2