Prepare 23.1.0

Author: hynek

CHANGELOG.md

@@ -13,7 +13,7 @@ You can find out backwards-compatibility policy [here](https://github.com/hynek/
 <!-- changelog follows -->
 
 
-## [Unreleased](https://github.com/hynek/structlog/compare/22.3.0...HEAD)
+## [23.1.0](https://github.com/hynek/structlog/compare/22.3.0...23.1.0) - 2023-04-06
 
 ### Added