chore(python): simplify nox steps in CONTRIBUTING.rst#187

tseaver merged 1 commit intomastergoogleapis/python-datastore:masterfrom

owl-bot-update-lock-99d90d097e4a4710cc8658ee0b5b963f4426d0e424819787c3ac1405c9a26719googleapis/python-datastore:owl-bot-update-lock-99d90d097e4a4710cc8658ee0b5b963f4426d0e424819787c3ac1405c9a26719Copy head branch name to clipboard