Add CHANGELOG

CHANGELOG.md

@@ -10,10 +10,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 *Aim: 3 species, 2 crop growth models, farm model, GAEC scenarios, experimental analysis*
 
-## [0.6.0] - unreleased
-
 *Plan: decouple CairoMakie (#81), fix & test ALMaSS, set up first experiments*
 
+## [0.6.0]
+
+**This point release re-implements the ALMaSS crop model**
+
+
 ### Added
 
 - `crop.cropdirectory` parameter specifies folder in which all crop data files for the
@@ -37,6 +40,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- The implementation of the ALMaSS vegetation model in Persefone has
+  been completely rewritten, hopefully more faithfully reproducing the
+  logic in ALMaSS.  The resulting plant heights are now more realistic
+  and do not produce the extreme plant heights seen previously (which
+  was due to an erroneous interpretation of the ALMaSS growth curves).
+
+
 ---
 
 ## [0.5.5] - 09-08-2024