* Add support for `UploadFile` in `File` parameter annotations.
* This includes a file-like interface.
* Here's the updated documentation for declaring <a href="https://fastapi.tiangolo.com/tutorial/request-files/#file-parameters-with-uploadfile" target="_blank"> `File` parameters with `UploadFile`</a>.
* And here's the updated documentation for using <a href="https://fastapi.tiangolo.com/tutorial/request-forms-and-files/" target="_blank">`Form` parameters mixed with `File` parameters, supporting `bytes` and `UploadFile`</a> at the same time.
* PR <a href="https://github.com/tiangolo/fastapi/pull/63" target="_blank">#63</a>.