Update version in _base.html

smash/web/templates/_base.html

@@ -269,7 +269,7 @@ desired effect
         {% block footer %}
             <!-- To the right -->
             <div class="pull-right hidden-xs">
-                Version: <strong>preview 0.7.0</strong> (21 June 2017)
+                Version: <strong>0.8.0</strong> (20 September 2017)
             </div>
 
             <!-- Default to the left -->