Bump sphinx from 2.4.2 to 2.4.3 (#466)

dependabot-preview[bot] · web-flow · commit 83740ddfe00e · 2020-02-24T07:02:46.000Z
diff --git a/requirements/doc.txt b/requirements/doc.txt
@@ -1,3 +1,3 @@
-sphinx==2.4.2
+sphinx==2.4.3
 pyenchant==2.0.0
 sphinxcontrib-spelling==4.3.0
