-r requirements.txt
pytest==5.4.1
tox==3.14.6
flake8==3.7.9
isort==4.3.21
docutils==0.16
check-manifest==0.41
readme-renderer==25.0
pygments==2.6.1
sphinx==3.0.0
sphinx_rtd_theme==0.4.3
coverage==5.0.4
twine==3.1.1
wheel==0.34.2
advbumpversion==1.2.0

-r requirements.txt
pytest==5.4.1
tox==3.14.6
flake8==3.7.9
isort==4.3.21
docutils==0.16
check-manifest==0.41
readme-renderer==25.0
pygments==2.6.1
sphinx==3.1.1
sphinx_rtd_theme==0.4.3
coverage==5.0.4
twine==3.1.1
wheel==0.34.2
advbumpversion==1.2.0

Update sphinx from 3.0.0 to 3.1.1
Update sphinx from 3.0.0 to 3.1.1