chore: prepare release v0.2.1 (#34)

Author: kangasta

CHANGELOG.md

@@ -5,6 +5,8 @@ See updating [Changelog example here](https://keepachangelog.com/en/1.0.0/)
 
 ## [Unreleased]
 
+## [0.2.1]
+
 ### Fixed
 
 - objsto_bucket_policy: when comparing policy documents, treat string value in `Action` field as equal to list containing that string as its only item, e.g. `"s3:PutObject"` vs. `["s3:PutObject"]`.
@@ -27,7 +29,8 @@ See updating [Changelog example here](https://keepachangelog.com/en/1.0.0/)
 
 - Minimal implementation of bucket, bucket policy, bucket lifecycle configuration, and object resources.
 
-[Unreleased]: https://github.com/UpCloudLtd/terraform-provider-upcloud/compare/v0.2.0...HEAD
+[Unreleased]: https://github.com/UpCloudLtd/terraform-provider-upcloud/compare/v0.2.1...HEAD
+[0.2.1]: https://github.com/UpCloudLtd/terraform-provider-upcloud/compare/v0.2.0...v0.2.1
 [0.2.0]: https://github.com/UpCloudLtd/terraform-provider-upcloud/compare/v0.1.1...v0.2.0
 [0.1.1]: https://github.com/UpCloudLtd/terraform-provider-upcloud/compare/v0.1.0...v0.1.1
 [0.1.0]: https://github.com/UpCloudLtd/terraform-provider-upcloud/releases/tag/v0.1.0