Bump version to 0.25

CHANGELOG.md

@@ -5,6 +5,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+## [0.25] - 2018-11-27
+
 ### Added
 - GraphQL API and playground (#117)
 - `spec.register-date` and `spec.retire-date` fields to `Machine` (#116).
@@ -77,7 +79,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 - Fix a bug that leaves files of deleted OS images (#86).
 
 [placemat]: https://github.com/cybozu-go/placemat
-[Unreleased]: https://github.com/cybozu-go/sabakan/compare/v0.24...HEAD
+[Unreleased]: https://github.com/cybozu-go/sabakan/compare/v0.25...HEAD
+[0.25]: https://github.com/cybozu-go/sabakan/compare/v0.24...v0.25
 [0.24]: https://github.com/cybozu-go/sabakan/compare/v0.23...v0.24
 [0.23]: https://github.com/cybozu-go/sabakan/compare/v0.22...v0.23
 [0.22]: https://github.com/cybozu-go/sabakan/compare/v0.21...v0.22