Eradicate

Features

- Updates to `flake8 >= 3.7`
- Updates `attrs < 20`
- Fixes plugin to work with `stdin`

Misc

- Changes how we use `flake8`, moves from `pytest-flake8` to native CLI

Features

- Adds `aggressive` configuration option
- Upgrades `eradicate` to `1.0`

Misc

- Improves readme
- Improves tests

Bugfixes

- Relies on `attrs` explicitly, see [2](https://github.com/sobolevn/flake8-eradicate/issues/2)

Misc

- Improves readme
- Improves tests

- Initial release