keps/sig-testing: 2539 status: implementable

It seems consensus is that implemented should only be used once stage is
stable. We're not there yet on this KEP, so drop back to implementable

Author: spiffxp

keps/sig-testing/2539-continuously-deploy-k8s-prow/kep.yaml

@@ -6,7 +6,7 @@ owning-sig: sig-testing
 participating-sigs:
 - sig-testing
 - sig-release
-status: implemented
+status: implementable
 creation-date: 2021-02-23
 last-updated: 2021-08-16
 reviewers: