A TimeoutException is thrown while trying to listen to docker system events using DockerAsync

Hi,

I tried to use `DockerAsync` client to listen to docker system events like so : 

```php
<?php
// filename : ./examples/listen-to-docker-events.php
require dirname(__DIR__) . '/vendor/autoload.php';

use Amp\Loop;
use Docker\DockerAsync;
use Docker\Stream\EventStream;

Loop::run(function () {
    $docker = DockerAsync::create();
    /** @var EventStream $events */
    $events = yield $docker->systemEvents();
    $events->onFrame(function ($event) {
       var_dump($event);
    });
    $events->wait();
});

```

After 15 seconds, `Amp\Artax\TimeoutException` is thrown : 

```
Fatal error: Uncaught Amp\Artax\TimeoutException: Allowed transfer timeout exceeded: 15000 ms in /app/vendor/amphp/artax/lib/DefaultClient.php on line 402

Amp\Artax\TimeoutException: Allowed transfer timeout exceeded: 15000 ms in /app/vendor/amphp/artax/lib/DefaultClient.php on line 402

Call Stack:
    0.0001     390472   1. {main}() /app/examples/server.php:0
    0.0105    1637376   2. Amp\Loop::run() /app/examples/server.php:16
    0.0107    1648320   3. Amp\Loop\NativeDriver->run() /app/vendor/amphp/amp/lib/Loop.php:76
   15.0209    6772248   4. Amp\Loop\NativeDriver->tick() /app/vendor/amphp/amp/lib/Loop/Driver.php:70
   15.0210    6769168   5. Amp\Loop\NativeDriver->error() /app/vendor/amphp/amp/lib/Loop/Driver.php:126
```
I'm running the code using the official PHP `7.2.5` docker image with the docker socket mounted as a volume ` --volume /var/run/docker.sock:/var/run/docker.sock:ro` and the following extensions :

```
[PHP Modules]
Core
ctype
curl
date
dom
fileinfo
filter
ftp
hash
iconv
intl
json
libxml
mbstring
mysqlnd
openssl
pcntl
pcre
PDO
pdo_sqlite
Phar
posix
readline
Reflection
session
SimpleXML
sodium
SPL
sqlite3
standard
tokenizer
xdebug
xml
xmlreader
xmlwriter
zlib

[Zend Modules]
Xdebug
```

It must be noted that every docker commands that don't use an `EventStream` are working as expected.

I tried to debug the call using xdebug, but I haven't found anything suspicious in your client.




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A TimeoutException is thrown while trying to listen to docker system events using DockerAsync #312

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A TimeoutException is thrown while trying to listen to docker system events using DockerAsync #312

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