ttrss/plugins/af_readability/composer.json

{
    "repositories": [
        {
        "name": "fivefilters/readability.php",
        "type": "vcs",
        "url": "https://dev.tt-rss.org/fox/readability-php.git"
        }
    ],
    "require": {
        "fivefilters/readability.php": "dev-master",
		  "psr/http-factory": "1.0.1"
    }
}