[ja] apply patch

ja/ebook/08.1.md

@@ -256,7 +256,7 @@ Go言語ではnetパッケージの`DialTCP`関数によってTCP接続を一つ
 	func handleClient(conn net.Conn) {
 		conn.SetReadDeadline(time.Now().Add(2 * time.Minute)) // set 2 minutes timeout
 		request := make([]byte, 128) // set maxium request length to 128KB to prevent flood attack
-		
+		defer conn.Close()  // close connection before exit
 		for {
 			read_len, err := conn.Read(request)