edited CHANGELOG.md

Author: gmao-rreichle

CHANGELOG.md

@@ -18,7 +18,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Cleaned up ldas_setup. Split out ldas.py and setup_utils.py.
 - Added reader for surface meteorological forcing from S2S-3.
-- Update `GEOSlandassim_GridComp/io_hdf5.F90` to allow for use with HDF5 1.14
+- Update `GEOSlandassim_GridComp/io_hdf5.F90` to allow for use with HDF5 1.14.
+- Changed default format of tile-space HISTORY output to nc4.
 
 ### Fixed