pbr>=2.0.0,!=2.1.0

Pygments
docutils
sphinx>=2.0.0,!=2.1.0 # BSD
openstackdocstheme>=2.2.1 # Apache-2.0
nwdiag
blockdiag
sphinxcontrib-blockdiag
sphinxcontrib-nwdiag
zuul-sphinx>=0.2.0