repos:
-   repo: https://github.com/pre-commit/pre-commit-hooks
    rev: v2.1.0
    hooks:
    -   id: trailing-whitespace
-   repo: https://github.com/ambv/black
    rev: 20.8b1
    hooks:
    - id: black
      language_version: python3.9
-   repo: https://gitlab.com/pycqa/flake8
    rev: 3.7.9
    hooks:
    - id: flake8