Finalize 0.4.0 (#60)

* Update README

* docs: fix README links (#61)

* chore: finalize 0.4.0 changelog (#62)

Author: simba-git

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.4.0] - 2025-06-12
+
 ### Added
 - Added shop_api_gateway example showing EnrichMCP as an API gateway
 - SQLAlchemy integration with `EnrichSQLAlchemyMixin`,