changelog

Signed-off-by: xil <xil@uber.com>

Author: luckyxilu66

CHANGELOG.md

@@ -4,6 +4,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ## [Unreleased]
 ### Added
+- Preprocessing - Support x-protobuf-name overrides existing property and parameter name ([#306](https://github.com/opensearch-project/opensearch-protobufs/pull/306))
 
 ### Changed