{% comment %}
  Footer for lesson pages.
{% endcomment %}
<footer>
  <div class="row">
    <div class="col-md-6" align="left">
      <h4>
	Copyright &copy; 2016
	{% if site.carpentry == "swc" %}
	<a href="{{ site.swc_site }}">Software Carpentry Foundation</a>
	{% elsif site.carpentry == "dc" %}
	<a href="{{ site.dc_site }}">Data Carpentry</a>
	{% elsif site.carpentry == "lc" %}
	<a href="{{ site.lc_site }}">Library Carpentry</a>
	{% endif %}
      </h4>
    </div>
    <div class="col-md-6" align="right">
      <h4>
	<a href="{{ site.github.repository_url }}/">Source</a>
	/
	<a href="{{ site.github.repository_url }}/blob/gh-pages/CONTRIBUTING.md">Contributing</a>
	/
	<a href="{{ site.github.repository_url }}/blob/gh-pages/CITATION">Cite</a>
	/
	<a href="{{ site.contact }}">Contact</a>
      </h4>
    </div>
  </div>
</footer>

{% comment %}
  Footer for lesson pages.
{% endcomment %}
<footer>
  <div class="row">
    <div class="col-md-6" align="left">
      <h4>
	Copyright &copy; 2016–{{ 'now' | date: "%Y" }}
	{% if site.carpentry == "swc" %}
	<a href="{{ site.swc_site }}">Software Carpentry Foundation</a>
	{% elsif site.carpentry == "dc" %}
	<a href="{{ site.dc_site }}">Data Carpentry</a>
	{% elsif site.carpentry == "lc" %}
	<a href="{{ site.lc_site }}">Library Carpentry</a>
	{% endif %}
      </h4>
    </div>
    <div class="col-md-6" align="right">
      <h4>
	<a href="{{ site.github.repository_url }}/">Source</a>
	/
	<a href="{{ site.github.repository_url }}/blob/gh-pages/CONTRIBUTING.md">Contributing</a>
	/
	<a href="{{ site.github.repository_url }}/blob/gh-pages/CITATION">Cite</a>
	/
	<a href="{{ site.contact }}">Contact</a>
      </h4>
    </div>
  </div>
</footer>

Update copyright year with current year
Update copyright year with current year
