-r ../requirements.txt
sphinx==2.2.2
sphinx_rtd_theme==0.4.3
sphinxcontrib-svg2pdfconverter

-r ../requirements.txt
sphinx==2.3.1
sphinx_rtd_theme==0.4.3
sphinxcontrib-svg2pdfconverter

Update dependency sphinx to v2.3.1
Update dependency sphinx to v2.3.1
