Update changelog

CHANGELOG.md

@@ -8,6 +8,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
   - [553](https://github.com/thoth-pub/thoth/pull/553) - Upgrade rust to `1.76.0` in production and development `Dockerfile`
   - [305](https://github.com/thoth-pub/thoth/issues/305) - Update rust edition to 2021
+  - [555](https://github.com/thoth-pub/thoth/pull/555) - Remove thoth-client's schema.json with auto-generated GraphQL schema language file on compilation
+
+### Added
+  - [244](https://github.com/thoth-pub/thoth/issues/244) - Expose GraphQL schema file in /schema.graphql
 
 ## [[0.11.15]](https://github.com/thoth-pub/thoth/releases/tag/v0.11.15) - 2024-01-18
 ### Changed