Update sphinx from 2.2.1 to 2.2.2

Author: pyup-bot

dev-requirements.txt

@@ -20,7 +20,7 @@ pyroma==2.6  # Packaging best practices checker
 pytest-cov==2.8.1  # Measure code coverage
 pytest==5.3.1  # Test runners
 PyYAML==5.1.2
-Sphinx==2.2.1
+Sphinx==2.2.2
 sphinx-autodoc-typehints==1.10.3
 sphinxcontrib-spelling==4.3.0
 twine==3.1.1