Merge pull request kubernetes#2925 from soltysh/cronjob_ga

Mark KEP-19 (CronJobs) implemented

Author: k8s-ci-robot

keps/sig-apps/19-Graduate-CronJob-to-Stable/kep.yaml

@@ -6,7 +6,7 @@ authors:
 owning-sig: sig-apps
 participating-sigs:
   - sig-scalability
-status: implementable
+status: implemented
 creation-date: 2019-04-18
 reviewers:
   - "@liggitt"