Added mssing async attribute value

Author: SimonTaylor

_includes/footer.html

@@ -105,4 +105,4 @@ <h4 class="fs-5 mb-0">Meet Us</h4>
     <script src="{{ script | relative_url }}" type="text/javascript"></script>
   {% endfor %}
 {% endif %}
-<script id="dsq-count-scr" src="//https-spt-development-com.disqus.com/count.js" async></script>
+<script id="dsq-count-scr" src="//https-spt-development-com.disqus.com/count.js" async="true"></script>