lint: run flake8

Run patched flake8 against the code.

flakehell lint

This command accepts all the same arguments as Flake8.

Run linter against a file:

flakehell lint example.py

Run linter against a few dirs:

flakehell lint ./flakehell/ ./tests/

Show available arguments:

flakehell lint --help

Read flake8 documentation for list of available options.