CHANGELOG.md in tee_logger-2.3.0 vs CHANGELOG.md in tee_logger-2.3.1

@@ -1,4 +1,8 @@
+# 2.3.1
+- refactoring
+  - TeeLogger#disable
+
 # 2.3.0
 - remove TeeLogger.attr_reader
   - and rename instance variable: @logger => @logfile
 - implementation `#level` and `level=`
 - implementation `#formatter` and `formatter=`