Option unfurl_media=false doesn't work

[o5]

I need to disable unfurling, but when I use option unfurl_media: false, the image is still shown.

This code reproduces it:

var Slack = require('node-slack');
var config = {
    hook: 'https://hooks.slack.com/services/<token>',
    channel: '#<channel>',
};

var slack = new Slack(config.hook);
slack.send({
    text: 'This message should not display image https://d3blmjzegggclu.cloudfront.net/assets/images/front/camera-big.png?1439887878, but image is shown.',
    username: 'TEST',
    channel: config.channel,
    unfurl_links: false,
    unfurl_media: false,
});

Result: