REL: Prepare release of v0.3.0

CHANGELOG.md

@@ -6,23 +6,13 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 
-## [Unreleased]
+## [0.3] - 2023-01-19
+(Florian Spreckelsen)
 
 ### Added
 
 * Messages for the Result of `SELECT` queries.
 
-### Changed
-
-### Deprecated
-
-### Removed
-
-### Fixed
-
-### Security
-
-
 ## [0.2] - 2022-03-25
 (Timm Fitschen)