-r requirements.txt
pytest==3.1.3
pytest-instafail==0.3.0
pytest-timeout==1.2.0
pytest-xdist==1.18.0
requests==2.18.1
selenium==3.4.3
websocket-client==0.44.0

-r requirements.txt
pytest==3.1.3
pytest-instafail==0.3.0
pytest-timeout==1.2.0
pytest-xdist==1.18.1
requests==2.18.1
selenium==3.4.3
websocket-client==0.44.0

Update pytest-xdist from 1.18.0 to 1.18.1
Update pytest-xdist from 1.18.0 to 1.18.1