improve document model and propagate changes. This include the change of document fixtures to better reflect what the api is effectively returning
<?php
namespace CorpusParole\Services;
use CorpusParole\Models\Document;
interface TranscriptManagerInterface {
function getConverter(string $converterKey, Document $document, string $source);
function getConverterUrl(string $converterKey, Document $document, string $url);
}