Generate id for each list item generated by instafeed

I'm using instafeed.js to get the latest instagram posts and I need an id generated for each list item. How can I do this?

JS:

var feed = new Instafeed({
    clientId: '<id>', //enter client id here
    limit: 5,
    sortBy: 'most-liked',
    //<div class="likes">&hearts; {{likes}}</div> ************************* likes count
    template: '<li><a href="{{link}}" target="_blank"><img class="img-responsive img-circle center-block" src="{{image}}"></li>'
});
feed.run();

HTML:

<ul id="instafeed"></ul>