Update to k8s 1.19.2

Signed-off-by: Davanum Srinivas <davanum@gmail.com>

vendor/sigs.k8s.io/structured-merge-diff/v4/README.md

@@ -57,8 +57,8 @@ Learn how to engage with the Kubernetes community on the [community page](http:/
 
 You can reach the maintainers of this project at:
 
-- [Slack](http://slack.k8s.io/)
-- [Mailing List](https://groups.google.com/forum/#!forum/kubernetes-wg-apply)
+- Slack: [#wg-api-expression](https://kubernetes.slack.com/messages/wg-api-expression)
+- [Mailing List](https://groups.google.com/forum/#!forum/kubernetes-wg-api-expression)
 
 ### Code of conduct
 

vendor/sigs.k8s.io/structured-merge-diff/v4/go.mod

@@ -1,4 +1,4 @@
-module sigs.k8s.io/structured-merge-diff/v3
+module sigs.k8s.io/structured-merge-diff/v4
 
 require gopkg.in/yaml.v2 v2.2.1
 
@@ -7,6 +7,7 @@ require (
 	github.com/json-iterator/go v1.1.6
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.1 // indirect
+	github.com/stretchr/testify v1.3.0 // indirect
 )
 
 go 1.13