title: Force WooCommerce to update fragment
body: <p>I created plugin which uses WooCommerce fragments for showing to user how many points they have. When user uses some of the points (by adding product into cart) everything works ok.</p>
  
  <p>But when admin adds points to user by admin-interface, the fragment is not updated until user adds a new product into cart.</p>
  
  <p>Here is code sample:</p>
  
  <pre><code>function create_points_widget_content() {
      $usersPoints = esc_attr( get_user_meta( get_current_user_id(), USERS_POINTS, true ));
      if (!isset($userPoints) || $userPoints == "") $userPoints = 0;
      $usedPoints = get_current_points_in_cart('', 0);
  
      ?&gt;
          &lt;div class="points-widget-v2"&gt;
              &lt;div&gt;&lt;?php echo __("Your points", "plugin-domain"); ?&gt;:&lt;span class="users-points"&gt;&lt;?php echo $usersPoints; ?&gt;&lt;/span&gt;&lt;/div&gt;
              &lt;div&gt;&lt;?php echo __("Actually used", "plugin-domain"); ?&gt;:&lt;span class="used-points"&gt;&lt;?php echo $usedPoints; ?&gt;&lt;/span&gt;&lt;/div&gt;
          &lt;/div&gt;
      &lt;?php
  }
  
  // Update top right price
  function add_points_widget_to_fragment( $fragments ) {
      global $woocommerce;
      ob_start();
  
      create_points_widget_content();
  
      $fragments['div.points-widget-v2'] = ob_get_clean();
      return $fragments;
  }
  add_filter('add_to_cart_fragments', 'add_points_widget_to_fragment');
  </code></pre>
  
  <p>Is there any way how to force fragments to refresh itself?</p>