Update README.md

Author: jayunit100

keps/NNNN-kep-template/README.md

@@ -127,7 +127,7 @@ Items marked with (R) are required *prior to targeting to a milestone / release*
 - [ ] (R) Enhancement issue in release milestone, which links to KEP dir in [kubernetes/enhancements] (not the initial KEP PR)
 - [ ] (R) KEP approvers have approved the KEP status as `implementable`
 - [ ] (R) Design details are appropriately documented
-- [ ] (R) Test plan is in place, giving consideration to SIG Architecture and SIG Testing input
+- [ ] (R) Test plan is in place, giving consideration to SIG Architecture and SIG Testing input (including test refactors)
 - [ ] (R) Graduation criteria is in place
 - [ ] (R) Production readiness review completed
 - [ ] Production readiness review approved