chore: prepare v0.15.0 release

Author: soerenmartius

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.15.0]
+
 ### Fixed
 
 - Set correct alternative type for `deploy_keys` in README
@@ -359,7 +361,8 @@ Please review plans and report regressions and issues asap so we can improve doc
 - This is the initial release of our GitHub Repository module with support for
   creating and managing GitHub Repositories for Organizations.
 
-[unreleased]: https://github.com/mineiros-io/terraform-github-repository/compare/v0.14.0...HEAD
+[unreleased]: https://github.com/mineiros-io/terraform-github-repository/compare/v0.15.0...HEAD
+[0.15.0]: https://github.com/mineiros-io/terraform-github-repository/compare/v0.14.0...v0.15.0
 [0.14.0]: https://github.com/mineiros-io/terraform-github-repository/compare/v0.13.0...v0.14.0
 [0.13.0]: https://github.com/mineiros-io/terraform-github-repository/compare/v0.12.0...v0.13.0
 [0.12.0]: https://github.com/mineiros-io/terraform-github-repository/compare/v0.11.0...v0.12.0