CHANGELOG.md in tee_logger-3.2.3 vs CHANGELOG.md in tee_logger-3.2.4

@@ -1,6 +1,12 @@
 # CHANGELOG.md
 
+## v3.2.4
+
[phone] JST
+
+- required_ruby_version change to `>= 2.6.0` because Ruby 2.5 reaches EOL.
+
 ## v3.2.3
 
 2020-01-03 JST
 
 - Add support for Ruby 3.0