Close all streams even if any stream closed normally #139
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WebSocket Client が 正常に ストリームを閉じた場合、シリアルポートを掴んだままとなり再接続不能になっていました。
kble を SIGINT 等で閉じると WebSocket ストリームは異常終了するため、この問題が顕在化していなかったと推測しています。