[php/v2] missing an event in the initialization of the event publisher

[benji07]

In the step 1 - 2 https://github.com/DevLyon/mixter/blob/php/v2/tests/Domain/Messages/MessageTest.php#L109

there is an event missing

    $messageId = MessageId::generate();
    $messageQuacked = new MessageQuacked($messageId, 'Hello', $authorId);
    $messageDeleted = new MessageDeleted($messageId, $authorId);
    $message = new Message(array($messageQuacked, $messageDeleted));

[benji07]

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