Merge pull request #1252 from VWS-Python/dependabot/pip/sphinx-substitution-extensions-2020.7.4.1

Bump sphinx-substitution-extensions from 2020.5.30.0 to 2020.7.4.1

Author: adamtheturtle

dev-requirements.txt

@@ -2,7 +2,7 @@
 # the setup function because Read The Docs needs a requirements file.
 PyYAML==5.3.1
 Pygments==2.6.1
-Sphinx-Substitution-Extensions==2020.5.30.0
+Sphinx-Substitution-Extensions==2020.7.4.1
 Sphinx==3.0.4
 VWS-Python-Mock==2019.12.27.0
 VWS-Test-Fixtures==2019.12.13.1