DOC: Update changelog

CHANGELOG.md

@@ -14,10 +14,17 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed (for changes in existing functionality)
 
+- Tests comply with the new entity error handling (see
+  [#32](https://gitlab.com/caosdb/caosdb-pylib/-/issues/32) in
+  caosdb-pylib).
+
 ### Deprecated (for soon-to-be removed features)
 
 ### Removed (for now removed features)
 
+- Some redundant tests from `test_tickets.py` that checked
+  functionality that was already tested in `test_error_stuff.py`.
+
 ### Fixed (for any bug fixes)
 
 - Tests for NaN Double Values (see https://gitlab.com/caosdb/caosdb-server/issues/41)