Update tox to 4.3.4#498

pyup-bot wants to merge 1 commit intodevelopinfOpen/cookiecutter-python-project:developfrom

pyup-update-tox-3.19.0-to-4.3.4infOpen/cookiecutter-python-project:pyup-update-tox-3.19.0-to-4.3.4Copy head branch name to clipboard