Update pytest to 7.0.0#158

pyup-bot wants to merge 1 commit intomasterleoschuch/libpythonpro:masterfrom

pyup-update-pytest-5.4.3-to-7.0.0leoschuch/libpythonpro:pyup-update-pytest-5.4.3-to-7.0.0Copy head branch name to clipboard