Release v1.21.0

Author: ppolewicz

CHANGELOG.md

@@ -6,6 +6,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.21.0] - 2023-04-17
+
 ### Added
 * Add support for custom upload timestamp
 
@@ -436,7 +438,8 @@ has changed.
 ### Added
 Initial official release of SDK as a separate package (until now it was a part of B2 CLI)
 
-[Unreleased]: https://github.com/Backblaze/b2-sdk-python/compare/v1.20.0...HEAD
+[Unreleased]: https://github.com/Backblaze/b2-sdk-python/compare/v1.21.0...HEAD
+[1.21.0]: https://github.com/Backblaze/b2-sdk-python/compare/v1.20.0...v1.21.0
 [1.20.0]: https://github.com/Backblaze/b2-sdk-python/compare/v1.19.0...v1.20.0
 [1.19.0]: https://github.com/Backblaze/b2-sdk-python/compare/v1.18.0...v1.19.0
 [1.18.0]: https://github.com/Backblaze/b2-sdk-python/compare/v1.17.3...v1.18.0