DOC: Update changelog

CHANGELOG.md

@@ -8,11 +8,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased] ##
 
 ### Added ###
+
 - Identifiable class to represent the information used to identify Records.
 - Added some StructureElements: BooleanElement, FloatElement, IntegerElement, 
   ListElement, DictElement
 
 ### Changed ###
+
 - Some StructureElements changed (see "How to upgrade" in the docs):
   - Dict, DictElement and DictDictElement were merged into DictElement.
   - DictTextElement and TextElement were merged into TextElement. The "match"
@@ -27,6 +29,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed ###
 
+- [#39](https://gitlab.com/caosdb/caosdb-crawler/-/issues/39) Merge conflicts in
+  `split_into_inserts_and_updates` when cached entity references a record
+  without id
+
 ### Security ###
 
 ### Documentation ###