Update version number in sidebar

Author: drewbarontini

source/shared/_sidebar.haml

@@ -6,7 +6,7 @@
         = image_tag 'logo.svg', alt: 'MVCSS', class: 'header-logo', width: '100', height: '110'
       .bucket-content
         %p.h1.header-title= link_to data.leo.title, '/index.html'
-        %p.header-version Version 4.0.7
+        %p.header-version Version 4.0.8
 
   = link_to 'View on GitHub', 'http://github.com/mvcss/mvcss', class: 'sidebar-btn'