-r requirements.txt
flake8==3.7.3
pytest==3.10.1
moto==1.3.7
pytest-env==0.6.2
pytest-mock==1.10.0
pytest-cov==2.6.1
pytest-xdist==1.26.0
coveralls==1.5.1
freezegun==0.3.11
requests-mock==1.5.2
# optional requirements for jsonschema
strict-rfc3339==0.7
rfc3987==1.3.8

-r requirements.txt
flake8==3.7.4
pytest==3.10.1
moto==1.3.7
pytest-env==0.6.2
pytest-mock==1.10.0
pytest-cov==2.6.1
pytest-xdist==1.26.0
coveralls==1.5.1
freezegun==0.3.11
requests-mock==1.5.2
# optional requirements for jsonschema
strict-rfc3339==0.7
rfc3987==1.3.8

Update flake8 from 3.7.3 to 3.7.4
Update flake8 from 3.7.3 to 3.7.4