describe the request

Hello,

The documentation currently states:

Flake8 relies on functionality provided by setuptools called Entry Points. These allow any package to register a plugin with Flake8 via that package’s setup.py file.

Any interest in having this part of the documentation updated to point to the Packaging user guide instead, so that people can be aware this is not a setuptools-only feature anymore?

(Without changing the setup.py example, I believe it is still up to date?)