composer.json
{
"require": {
"symfony/event-dispatcher": "2.6.11",
"guzzlehttp/guzzle": "6.3.0",
"swiftmailer/swiftmailer": "5.0.1",
"michelf/php-markdown": "1.3",
"ralouphie/getallheaders": "^2.0",
"setasign/fpdi-fpdf": "1.6.2",
"dompdf/dompdf": "^0.8.1",
"mandrill/mandrill": "^1.0"
}
}