Update changelog for 0.5.0 release

Signed-off-by: rithin-pullela-aws <[email protected]>

Author: rithin-pullela-aws

CHANGELOG.md

@@ -4,6 +4,13 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ## [Unreleased]
 
+### Added
+
+### Fixed
+
+### Removed
+
+## [Released 0.5.0]
 ### Added
 - Add `GenericOpenSearchApiTool` - A flexible, general-purpose tool that can interact with any OpenSearch API endpoint, addressing tool explosion and reducing context size. Supports all HTTP methods with write operation protection via `OPENSEARCH_SETTINGS_ALLOW_WRITE` environment variable. Closes [#109](https://github.com/opensearch-project/opensearch-mcp-server-py/issues/109)
 - Add header-based authentication + Code Clean up ([#117](https://github.com/opensearch-project/opensearch-mcp-server-py/pull/117))