Updated change log

Author: mwetter

buildingspy/CHANGES.txt

@@ -4,6 +4,9 @@ BuildingsPy Changelog
 Version 5.2.0, xxxx
 ^^^^^^^^^^^^^^^^^^^
 
+- In buildingspy/development/regressiontest.py, add option to create reference
+  results in batch mode.
+  (https://github.com/lbl-srg/BuildingsPy/issues/560)
 - For Optimica regression tests, added check for Integers that are too large to be represented
 - In buildingspy/development/refactor.py, corrected moving images to avoid creating
   a directory if the target directory already exists.