Bump sphinx from 3.2.1 to 3.3.0 (#389)

dependabot-preview[bot] · web-flow · commit d62543bf8337 · 2020-11-03T05:46:13.000Z
diff --git a/requirements-dev.txt b/requirements-dev.txt
@@ -13,5 +13,5 @@ pytest-aiohttp==0.3.0
 pytest-cov==2.10.1
 pytest-cov==2.10.1
 pytest-sugar==0.9.4
-sphinx==3.2.1
+sphinx==3.3.0
 yarl==1.6.2
