Update pytest to 6.0.0#256

pyup-bot wants to merge 2 commits intomasterjoaogarciadelima/libpythonpro:masterfrom

pyup-update-pytest-5.3.2-to-6.0.0joaogarciadelima/libpythonpro:pyup-update-pytest-5.3.2-to-6.0.0Copy head branch name to clipboard