-r requirements.txt
pytest==4.4.0
pytest-mock==1.10.3
pytest-cov==2.6.1
pytest-xdist==1.27.0
requests-mock==1.5.2
freezegun==0.3.11
flake8==3.7.7
flake8-print==3.1.0

-r requirements.txt
pytest==4.4.0
pytest-mock==1.10.3
pytest-cov==2.6.1
pytest-xdist==1.28.0
requests-mock==1.5.2
freezegun==0.3.11
flake8==3.7.7
flake8-print==3.1.0

Update pytest-xdist from 1.27.0 to 1.28.0
Update pytest-xdist from 1.27.0 to 1.28.0