CHANGELOG.md in runger_style-3.0.0 vs CHANGELOG.md in runger_style-4.0.0

@@ -1,4 +1,7 @@
+## v4.0.0 (2024-12-31)
+[no unreleased changes yet]
+
 ## v3.0.0 (2024-12-11)
 - Increase minimum required `rubocop` version to 1.68.0.
 
 ## v2.19.0 (2024-12-10)
 - Disable `Style/SafeNavigationChainLength` cop.