Update pytest to 5.3.4#157

pyup-bot wants to merge 1 commit intomasterAl1rios/libpythonpro:masterfrom

pyup-update-pytest-3.6.1-to-5.3.4Al1rios/libpythonpro:pyup-update-pytest-3.6.1-to-5.3.4Copy head branch name to clipboard