chore: Update changelog

Author: qqilihq

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [4.0.1] – unreleased
+## [4.0.1] – 2025-10-09
 ### Fixed
 - Use https: URL for endpoints everywhere
 
@@ -47,6 +47,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - This CHANGELOG file
 - Allow querying for historical data using `fetchHistoric` and `fetchHistoric90d`
 
+[4.0.1]: https://github.com/qqilihq/ecb-euro-exchange-rates/compare/v4.0.0...v4.0.1
+[4.0.0]: https://github.com/qqilihq/ecb-euro-exchange-rates/compare/v3.0.0...v4.0.0
 [3.0.0]: https://github.com/qqilihq/ecb-euro-exchange-rates/compare/v2.0.2...v3.0.0
 [2.0.2]: https://github.com/qqilihq/ecb-euro-exchange-rates/compare/v2.0.1...v2.0.2
 [2.0.1]: https://github.com/qqilihq/ecb-euro-exchange-rates/compare/v2.0.0...v2.0.1