message: docs: Add FastAPI to real-life usages in README
diff: @@ -70,6 +70,7 @@ Additionally, all the 1.x releases are hosted on our GitHub Pages-based **CDN**:
  - [Shopify Draft Orders](https://help.shopify.com/api/draft-orders)
  - [Discourse](http://docs.discourse.org)
  - [APIs.guru](https://apis.guru/api-doc/)
  +- [FastAPI](https://github.com/tiangolo/fastapi)
  ## Deployment
  