* Add Flake8 linting. Original PR [#1774](https://github.com/tiangolo/fastapi/pull/1774) by [@MashhadiNima](https://github.com/MashhadiNima).
* Disable Gitter bot, as it's currently broken, and Gitter's response doesn't show the problem. PR [#1853](https://github.com/tiangolo/fastapi/pull/1853).