Adds changelog

Signed-off-by: Ashwin P Chandran <ashwinpc@amazon.com>

Author: ashwin-pc

CHANGELOG.md

@@ -149,6 +149,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - [CI] Reduce redundancy by using matrix strategy on Windows and Linux workflows ([#3514](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3514))
 - Add an achievement badger to the PR ([#3721](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3721))
 - Install chrome driver for functional tests from path set by environment variable `TEST_BROWSER_BINARY_PATH`([#3997](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3997))
+- Adds threshold to code coverage config to prevent workflow failures ([#4040](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/4040))
 
 ### 📝 Documentation