Update changelog

Signed-off-by: Lizzie Lundgren <elundgren@seas.harvard.edu>

Author: lizziel

CHANGELOG.md

@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - Add debug logger call to print out the name of the container being read from `ExtData.rc`
 - Added dimensionless vertical coordinates to criteria for vertically flipping imports in ExtData
+- Added ExtData2G criteria for presence of vertical coordinate for cases of non-CF-compliant files
 
 ### Changed