update changelog

Author: samuelbray32

CHANGELOG.md

@@ -11,12 +11,14 @@
 - Update export process to include `~external` tables #1239
 - Only add merge parts to `source_class_dict` if present in codebase #1237
 - Remove cli module #1250
+- Fix column error in `check_threads` method #1256
 
 ### Pipelines
 
 - Common
     - Set `probe_id` as `probe_description` when inserting from nwb file #1220
     - Default `AnalysisNwbfile.create` permissions are now 777 #1226
+    - Make `Nwbfile.fetch_nwb` functional # 1256
 - Position
     - Allow population of missing `PositionIntervalMap` entries during population
         of `DLCPoseEstimation` #1208