pytest==3.2.2
pytest-cov==2.5.1
python-coveralls==2.9.1
pillow==6.0.0
pytest==4.4.0
pytest-cov==2.5.1
python-coveralls==2.9.1
pillow==6.0.0
pytest-xdist==1.28.0

Update pytest and add pytest-xdist
chore: Update pytest and add pytest-xdist

To enable parallel testing