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* Add article [Deploying a scikit-learn model with ONNX and FastAPI](https://medium.com/@nico.axtmann95/deploying-a-scikit-learn-model-with-onnx-und-fastapi-1af398268915) by [Nico Axtmann](https://www.linkedin.com/in/nico-axtmann). PR [#438](https://github.com/tiangolo/fastapi/pull/438) by [@naxty](https://github.com/naxty).
* Allow setting custom `422` (validation error) response/schema in OpenAPI.