Notify user when new kubernetes version is available

Change emoji for telling that new kubernetes is available.

cmd/minikube/cmd/start.go

@@ -997,7 +997,9 @@ func getKubernetesVersion(old *config.ClusterConfig) string {
 
 	}
 	if defaultVersion.GT(nvs) {
-		out.T(out.ThumbsUp, "Kubernetes {{.new}} is now available. If you would like to upgrade, specify: --kubernetes-version={{.new}}", out.V{"new": defaultVersion})
+        out.T(out.New,
+              "Kubernetes {{.new}} is now available. If you would like to upgrade, specify: --kubernetes-version={{.new}}",
+              out.V{"new": defaultVersion})
 	}
 	return nv
 }

pkg/minikube/out/style.go

@@ -85,6 +85,7 @@ var styles = map[StyleEnum]style{
 	Unpause:       {Prefix: "⏯️  "},
 	Confused:      {Prefix: "😕  "},
 	Shrug:         {Prefix: "🤷  "},
+	New:           {Prefix: "🆕  "},
 
 	// Specialized purpose styles
 	ISODownload:      {Prefix: "💿  "},

pkg/minikube/out/style_enum.go

@@ -92,4 +92,5 @@ const (
 	AddonEnable
 	AddonDisable
 	Shrug
+	New
 )