breathe>=4.4
docutils>=0.13
Pygments>=2.2
pyparsing>=2.1
Sphinx>=1.5
sphinxcontrib-bibtex>=0.3
sphinxcontrib-doxylink>=1.3
sphinx_rtd_theme>=0.3
requests[security]

breathe>=4.4
docutils>=0.13
Pygments>=2.2
pyparsing>=2.1
Sphinx>=1.8.5
sphinxcontrib-bibtex>=0.3.3
sphinxcontrib-doxylink>=1.3
sphinx_rtd_theme>=0.3
requests[security]

Update minimum sphinx requirement for docs
Update minimum sphinx requirement for docs
