NEWS.md in fluent-plugin-concat-2.2.3 vs NEWS.md in fluent-plugin-concat-2.3.0

@@ -1,6 +1,12 @@
 # ChangeLog
 
+## v2.3.0
+
+### Improvements
+
+* Support `partial_key`, `partial_value` to concatenate split log lines. See #46, #52
+
 ## v2.2.3
 
 ### Fixes
 
 * Fix a bug that `@timeout_map` will be updated while traversing it. See #49