Roots.io - 3 Widget Footer

<footer>
  <div class="container content-info">
    <div class="row">
      <div class="col-sm-4">
        <?php dynamic_sidebar('footer-left'); ?>
      </div>
      <div class="col-sm-4">
        <?php dynamic_sidebar('footer-center'); ?>
      </div>
      <div class="col-sm-4">
        <?php dynamic_sidebar('footer-right'); ?>
      </div>
    </div>
  </div>
  <div class="container copyright">
    <div class="row">
      <div class="col-sm-6">
        <p>&copy; <?php echo date('Y'); ?> <?php bloginfo('name'); ?></p>
      </div>
      <div class="col-sm-6">
        <a class="pull-right" href="#" title="" target="_blank"><img src="<?php echo get_template_directory_uri(); ?>/assets/img/icon.png" alt=""></a>
      </div>
    </div>
  </div>
</footer>

<?php wp_footer(); ?>

Roots.io - Addition for widgets.php

register_sidebar(array(
    'name'          => __('Footer Left', 'roots'),
    'id'            => 'footer-left',
    'before_widget' => '<section class="widget %1$s %2$s"><div class="widget-inner">',
    'after_widget'  => '</div></section>',
    'before_title'  => '<h3>',
    'after_title'   => '</h3>',
  ));

  register_sidebar(array(
    'name'          => __('Footer Center', 'roots'),
    'id'            => 'footer-center',
    'before_widget' => '<section class="widget %1$s %2$s"><div class="widget-inner">',
    'after_widget'  => '</div></section>',
    'before_title'  => '<h3>',
    'after_title'   => '</h3>',
  ));

  register_sidebar(array(
    'name'          => __('Footer Right', 'roots'),
    'id'            => 'footer-right',
    'before_widget' => '<section class="widget %1$s %2$s"><div class="widget-inner">',
    'after_widget'  => '</div></section>',
    'before_title'  => '<h3>',
    'after_title'   => '</h3>',
  ));