vup: show the current V version after an update

cmd/tools/vup.v

@@ -30,6 +30,7 @@ fn main() {
 	// println(v_hash)
 	// println(current_hash)
 	if v_hash == current_hash {
+		show_current_v_version()
 		return
 	}
 
@@ -60,6 +61,12 @@ fn main() {
 	_ := os.exec('v cmd/tools/vup.v') or {
 		panic(err)
 	}
+	show_current_v_version()    
+}
+
+fn show_current_v_version(){
+	println('Current V version:')
+	os.system('v version')
 }
 
 fn backup(file string) {