Bump redis from 3.3.4 to 3.3.6 (#260)

dependabot-preview[bot] · web-flow · commit 159aa8174163 · 2019-08-07T06:04:19.000Z
diff --git a/requirements.txt b/requirements.txt
@@ -2,6 +2,6 @@ cherry_picker==1.3.2
 aiohttp==3.5.4
 gidgethub==3.1.0
 cachetools==3.1.1
-redis==3.3.4
+redis==3.3.6
 celery==4.3.0
 sentry-sdk==0.10.2
