* Use default response status code descriptions for additional responses. PR [#313](https://github.com/tiangolo/fastapi/pull/313) by [@duxiaoyao](https://github.com/duxiaoyao).
* Upgrade Pydantic support to `0.28`. PR [#320](https://github.com/tiangolo/fastapi/pull/320) by [@jekirl](https://github.com/jekirl).