fix(helm): add message if release deleted successfully

kubernetes has explicit delete message that user can know resources being deleted for sure,
suggest also add this behavior to helm, as it is too 'quiet' for deletion operation right now.

cmd/helm/delete.go

@@ -69,6 +69,8 @@ func newDeleteCmd(c helm.Interface, out io.Writer) *cobra.Command {
 				if err := del.run(); err != nil {
 					return err
 				}
+
+				fmt.Fprintf(out, "release \"%s\" deleted\n", del.name)
 			}
 			return nil
 		},