Ratchet/0.4.3 how to send binary data?
I use Ratchet/0.4.3 to send data via WS-but I am interested in how can I send data in binary form? Judging by [this code](https://github.com/dizard/Ratchet) I have to make a call
`$from->sendBinary($data);`

But it doesn't work ConnectionInterface no this is the method
```php
<?php
namespace Ratchet;

/**
 * The version of Ratchet being used
 * @var string
 */
const VERSION = 'Ratchet/0.4.3';

/**
 * A proxy object representing a connection to the application
 * This acts as a container to store data (in memory) about the connection
 */
interface ConnectionInterface {
    /**
     * Send data to the connection
     * @param  string $data
     * @return \Ratchet\ConnectionInterface
     */
    function send($data);

    /**
     * Close the connection
     */
    function close();
}

```

Does anyone know how to send me binary data?