Installation error: (type *"k8s.io/client-go/kubernetes".Clientset has no field or method Core)

[fadhilkurnia]

Hi, I want to install stern using go get but get these errors. It will be better if stern use go.mod and go.sum since govendor is already deprecated. Thanks!

$ go get github.com/wercker/stern 

# github.com/wercker/stern/stern
src/github.com/wercker/stern/stern/main.go:46:45: clientset.Core undefined (type *"k8s.io/client-go/kubernetes".Clientset has no field or method Core)
src/github.com/wercker/stern/stern/main.go:70:29: clientset.Core undefined (type *"k8s.io/client-go/kubernetes".Clientset has no field or method Core)
src/github.com/wercker/stern/stern/tail.go:106:28: not enough arguments in call to req.Stream
	have ()
	want (context.Context)
src/github.com/wercker/stern/stern/watch.go:47:25: not enough arguments in call to i.Watch
	have ("k8s.io/apimachinery/pkg/apis/meta/v1".ListOptions)
	want (context.Context, "k8s.io/apimachinery/pkg/apis/meta/v1".ListOptions)