Add another missing CHANGELOG entry

CHANGELOG.md

@@ -31,6 +31,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `simulate()` and `initialise()` now take a `params` keyword argument that can be used to
   override parameters from other input sources
 
+- The ALMaSS crop data config file
+  `data/crops/almass/crop_data_general.csv` now has extra columns for
+  `is_c4_plant`, `sowingdensity`, and `phase_before_harvest`
+
 ### Deprecated
 
 ### Removed