Update tox to 4.21.2#480

pyup-bot wants to merge 1 commit intomasterfundamentals-of-data-science/ds-fundamentals-python:masterfrom

pyup-update-tox-3.9.0-to-4.21.2fundamentals-of-data-science/ds-fundamentals-python:pyup-update-tox-3.9.0-to-4.21.2Copy head branch name to clipboard