CHANGELOG.md in xgb-0.8.0 vs CHANGELOG.md in xgb-0.9.0

@@ -1,4 +1,12 @@
+## 0.9.0 (2024-10-17)
+
+- Updated XGBoost to 2.1.1
+- Added support for callbacks
+- Added `num_features` and `save_config` methods to `Booster`
+- Added `num_nonmissing` and `data_split_mode` methods to `DMatrix`
+- Dropped support for Ruby < 3.1
+
 ## 0.8.0 (2023-09-13)
 
 - Updated XGBoost to 2.0.0
 - Dropped support for Ruby < 3