-r requirements.txt

black==19.10b0
flake8==3.7.9
isort==4.3.21
mypy==0.750
flake8-bugbear==19.8.0
flake8-builtins==1.4.1
flake8-comprehensions==3.1.4
flake8-mutable==1.2.0
flake8-tuple==0.4.1