Fixed typo in CHANGELOG from merged PR #576 (#577)

Signed-off-by: Djcarrillo6 <[email protected]>

CHANGELOG.md

@@ -32,7 +32,6 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Deprecated point-in-time APIs (list_all_point_in_time, create_point_in_time, delete_point_in_time) and Security Client APIs (health_check and update_audit_config) ([#502](https://github.com/opensearch-project/opensearch-py/pull/502))
 ### Removed
 - Removed leftover support for Python 2.7 ([#548](https://github.com/opensearch-project/opensearch-py/pull/548))
-- Removed leftover support for Python 3.6 ([#576](https://github.com/opensearch-project/opensearch-py/pull/576))
 ### Fixed
 - Fixed automatically built and deployed docs ([575](https://github.com/opensearch-project/opensearch-py/pull/575))
 ### Security