   <!-- Footer -->
    <footer>
        <div class="container text-center">
            <p>Copyright &copy; {{ site.author }} 2014</p>
        </div>
    </footer>

   <!-- Footer -->
    <footer>
        <div class="container text-center">
            <p>Copyright &copy; {{ site.author }} {{ site.time | date: "%Y" }}</p>
        </div>
    </footer>

Change copyright year to change annually.
Change copyright year to change annually.
