Update CHANGELOG.md

Author: morgante

CHANGELOG.md

@@ -8,6 +8,12 @@ Extending the adopted spec, each change should have a link to its corresponding
 
 ## [Unreleased]
 
+## [v6.1.1] - 2019-12-04
+
+### Fixed
+
+- Fix endpoint output for private clusters where `private_nodes=false`. [#365](https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/pull/365)
+
 ## [v6.1.0] - 2019-12-03
 
 ### Added
@@ -257,7 +263,8 @@ In either case, upgrading to module version `v1.0.0` will trigger a recreation o
 
 * Initial release of module.
 
-[Unreleased]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/compare/v6.1.0...HEAD
+[Unreleased]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/compare/v6.1.1...HEAD
+[v6.1.1]: https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/compare/v6.1.0...v6.1.1
 [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/v5.1.0...v6.0.0