Upgrade Sphinx to 2.1.2 (home-assistant#24693)

fabaff · cgtobi · commit 0132ac3c2770 · 2019-06-23T07:49:40.000+02:00
diff --git a/requirements_docs.txt b/requirements_docs.txt
@@ -1,3 +1,3 @@
-Sphinx==2.0.1
+Sphinx==2.1.2
 sphinx-autodoc-typehints==1.6.0
 sphinx-autodoc-annotation==1.0.post1
