Update celery from 4.2.0 to 4.2.1 (#117)

pyup-bot · Mariatta · commit 1a36e904f604 · 2018-07-18T06:02:59.000-07:00
diff --git a/requirements.txt b/requirements.txt
@@ -4,4 +4,4 @@ gidgethub==2.5.0.post1
 cachetools==2.1.0
 requests==2.19.1
 redis==2.10.6
-celery==4.2.0
+celery==4.2.1
