-r requirements.txt
pycodestyle==2.3.1
pytest==3.2.1
pytest-mock==1.6.2
pytest-cov==2.5.1
pytest-xdist==1.19.0
coveralls==1.1
moto==1.0.1
httpretty==0.8.14
beautifulsoup4==4.6.0
freezegun==0.3.9

-r requirements.txt
pycodestyle==2.3.1
pytest==3.2.1
pytest-mock==1.6.2
pytest-cov==2.5.1
pytest-xdist==1.19.1
coveralls==1.1
moto==1.0.1
httpretty==0.8.14
beautifulsoup4==4.6.0
freezegun==0.3.9

Update pytest-xdist from 1.19.0 to 1.19.1
Update pytest-xdist from 1.19.0 to 1.19.1