-r optional.txt

isort>=4.2.3
pycodestyle==2.5.0
pydocstyle==5.0.2 ;python_version > '3.0'
pydocstyle==3.0.0 ;python_version < '3.0'
pytest==5.3.3 ;python_version > '3.0'
pytest==4.6.9 ;python_version < '3.0'
pytest-cov==2.8.1
pytest-xdist==1.31.0
Sphinx==2.3.1 ;python_version > '3.0'
Sphinx==1.8.5 ;python_version < '3.0'
