Update pytest-cov to 4.0.0#174

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

pyup-update-pytest-cov-2.10.1-to-4.0.0limberger/libpythonpro:pyup-update-pytest-cov-2.10.1-to-4.0.0Copy head branch name to clipboard