Describe supported version changes in CHANGELOG

Author: Ryoya Mukai

CHANGELOG.md

@@ -8,12 +8,18 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ### Added
 
+- Support ActiveRecord 7.1 and 7.2 [#21](https://github.com/cookpad/armg/pull/21)
+- Support Ruby 3.2, 3.3, and 3.4 [#21](https://github.com/cookpad/armg/pull/21)
+
 ### Changed
 
 ### Deprecated
 
 ### Removed
 
+- Drop support for ActiveRecord 6.0 and 6.1 [#21](https://github.com/cookpad/armg/pull/21)
+- Drop support for Ruby 2.7 and 3.0 [#21](https://github.com/cookpad/armg/pull/21)
+
 ### Fixed
 
 ### Security