CHANGELOG.md in xgb-0.7.3 vs CHANGELOG.md in xgb-0.8.0

@@ -1,4 +1,9 @@
+## 0.8.0 (2023-09-13)
+
+- Updated XGBoost to 2.0.0
+- Dropped support for Ruby < 3
+
 ## 0.7.3 (2023-07-24)
 
 - Fixed error with `dup` and `clone`
 
 ## 0.7.2 (2023-05-12)