pycodestyle; python_version > '3.5'
nose2; python_version > '3.5'
coverage; python_version > '3.5'
coveralls; python_version > '3.5'
pyflakes; python_version > '3.5'
pylint; python_version > '3.5'
halo; python_version > '3.5'
distro; python_version > '3.5'
linkcheckmd; python_version > '3.5'