gituser/docker_multiarch_dev: links for pytest-cov

gituser/docker_multiarch pytest_cov-4.0.0-py3-none-any.whl
gituser/docker_multiarch pytest_cov-3.0.0-py3-none-any.whl
gituser/docker_multiarch pytest_cov-2.8.1-py2.py3-none-any.whl