Update CHANGELOG.md

Author: morgante

CHANGELOG.md

@@ -260,7 +260,7 @@ In either case, upgrading to module version `v1.0.0` will trigger a recreation o
 [Unreleased]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/compare/v6.1.0...HEAD
 [v6.1.0]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/compare/v6.0.1...v6.1.0
 [v6.0.1]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/compare/v6.0.0...v6.0.1
-[v6.0.0]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/compare/v5.2.0...v6.0.0
+[v6.0.0]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/compare/v5.1.0...v6.0.0
 [v5.2.0]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/compare/v5.1.1...v5.2.0
 [v5.1.1]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/compare/v5.1.0...v5.1.1
 [v5.1.0]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/compare/v5.0.0...v5.1.0