Bump celery from 4.4.0 to 4.4.1 (#320)

dependabot-preview[bot] · web-flow · commit 5e4783ed5b9e · 2020-03-03T05:39:59.000Z
diff --git a/requirements.txt b/requirements.txt
@@ -3,5 +3,5 @@ aiohttp==3.6.2
 gidgethub==3.3.0
 cachetools==4.0.0
 redis==3.4.1
-celery==4.4.0
+celery==4.4.1
 sentry-sdk==0.14.2
