Error message:

E:\github\client-go>go mod tidy
go: finding module for package k8s.io/client-go/kubernetes
go: finding module for package k8s.io/client-go/tools/clientcmd
go: finding module for package k8s.io/apimachinery/pkg/apis/meta/v1
go: found k8s.io/apimachinery/pkg/apis/meta/v1 in k8s.io/apimachinery v0.22.2
go: finding module for package k8s.io/client-go/kubernetes
go: finding module for package k8s.io/client-go/tools/clientcmd
client-go imports
        k8s.io/client-go/kubernetes: module k8s.io/client-go@latest found (v1.5.2), but does not contain package k8s.io/client-go/kubernetes
client-go imports
        k8s.io/client-go/tools/clientcmd: module k8s.io/client-go@latest found (v1.5.2), but does not contain package k8s.io/client-go/tools/clientcmd

Solution:
always specify three files in the go.mod file

require (
    ...
    k8s.io/api v0.19.0
    k8s.io/apimachinery v0.19.0
    k8s.io/client-go v0.19.0
    ...
)