Sphinx==1.8.5

sphinx-autobuild==0.7.1
sphinx_rtd_theme==0.4.3
sphinxcontrib-blockdiag==1.5.5
sphinxcontrib-spelling==4.2.1

# sphinx-autobuild has a dependency on Tornado,
# but Tornado 6.0 dropped support for Python 2.7
tornado<6.0