Update pytest to 4.2.1#573

sliverc merged 2 commits intomasterdjango-json-api/django-rest-framework-json-api:masterfrom

pyup-update-pytest-4.2.0-to-4.2.1django-json-api/django-rest-framework-json-api:pyup-update-pytest-4.2.0-to-4.2.1Copy head branch name to clipboard