Aiopenapi3

What's Changed
* optional httpx-auth by ggpwnkthx https://github.com/commonism/aiopenapi3/pull/92
* Case-insensitive securityScheme (fixes 96) by hsunner in https://github.com/commonism/aiopenapi3/pull/97
* incomplete support for formdata & forms / multipart/form-data & application/x-www-form-urlencoded

New Contributors
* hsunner made their first contribution in https://github.com/commonism/aiopenapi3/pull/97
* ggpwnkthx made their first contribution in https://github.com/commonism/aiopenapi3/pull/92

**Full Changelog**: https://github.com/commonism/aiopenapi3/compare/v0.2.0...v0.2.1

What's Changed

* [documentation on rtd](https://aiopenapi3.readthedocs.io/en/latest/)
* [cli got subcommands](https://aiopenapi3.readthedocs.io/en/latest/use.html#command-line)
* added OpenAPI.__copy__
* added OpenAPI.createRequest
* plugins message.received can be used to mangle the raw responses status_code content_type and headers
* [improved Exceptions](https://aiopenapi3.readthedocs.io/en/latest/api.html#exceptions)

**Full Changelog**: https://github.com/commonism/aiopenapi3/compare/v0.1.7...v0.2.0