DOC: Update changelog for release

CHANGELOG.md

@@ -5,7 +5,8 @@ All notable changes to this project will be documented in this file.
 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] ##
+## [0.3.0] - 2022-01-30 ##
+(Florian Spreckelsen)
 
 ### Added ###
 
@@ -33,14 +34,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - create_flat_list function now collects entities in a set and also adds the entities
   contained in the given list directly
 
-
 ### Deprecated ###
 
 - The DictXYElements are now depricated and are now synonyms for the
   XYElements.
 
-### Removed ###
-
 ### Fixed ###
 
 - [#39](https://gitlab.com/caosdb/caosdb-crawler/-/issues/39) Merge conflicts in
@@ -48,10 +46,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   without id
 - Queries for identifiables with boolean properties are now created correctly.
 
-### Security ###
-
-### Documentation ###
-
 ## [0.2.0] - 2022-11-18 ##
 (Florian Spreckelsen)