Add version in footer

Author: yatil

_config.yml

@@ -7,6 +7,7 @@ url: "http://yourdomain.com" # the base hostname & protocol for your site
 twitter_username: yatil
 github_username:  yatil
 status: draft
+version: "2.1.1"
 
 techniqueurl: http://www.w3.org/TR/WCAG20-TECHS/
 

_includes/footer.html

@@ -1,7 +1,7 @@
 <footer role="contentinfo" aria-labelledby="wai_footerheading">
    <hr>
    <h2 id="wai_footerheading" class="sr-only">Document Information</h2>
-   <p><strong>Status:</strong>{%if site.status == "draft" %}<strong> Draft.</strong>{% endif %} Updated {{ site.time | date:"%d %b %Y" }}<br />
+   <p><strong>Status:</strong>{%if site.status == "draft" %}<strong> Draft.</strong>{% endif %} Updated {{ site.time | date:"%d %b %Y" }}. Version {{site.version}}<br />
       Lead Developer: <a href="http://www.w3.org/People/yatil/">Eric Eggert</a> (W3C). Project Lead: <a href="http://www.w3.org/People/shadi/">Shadi Abou-Zahra</a> (W3C).<br>Previous editors and developers: Gregg Vanderheiden, Loretta Guarino Reid, Ben Caldwell, <a href="http://www.w3.org/People/Shawn/">Shawn Lawton Henry</a>, Gez Lemon.<br>The {{ site.time | date:"%Y" }} redesign was developed by the Education and Outreach Working Group (<a href="http://www.w3.org/WAI/EO/">EOWG</a>) and the Web Content Accessibility Guidelines Working Group (<a href="http://www.w3.org/WAI/GL/">WCAG WG</a>),  with support from the <a href="http://www.w3.org/WAI/DEV/">WAI-DEV project</a>, a project of the European Commission IST Programme.</p>
 
    <nav aria-label="Footer Navigation" class="footer-nav">