update changelog

Author: rcannood

CHANGELOG.md

@@ -239,4 +239,7 @@
   and thus can't be directly overriden (new values given by get_donor_batch_map is int) (PR #119).
 
 * Update flowsom mapping similarity so we subset to just markers to correct, and lisi to remove control samples
-  and unlabelled cells (PR #119).
+  and unlabelled cells (PR #119).
+
+* Fix `average_batch_r2` and `flowsom_mapping_similarity` writing `metric_ids` and `metric_values`
+  as scalars instead of lists, as required by `file_score.yaml` (PR #130).