adding support for vcl language

Author: weaverryan

src/Renderers/CodeNodeRenderer.php

@@ -24,6 +24,7 @@ class CodeNodeRenderer implements NodeRenderer
         'php-symfony'     => 'php',
         'varnish4'        => 'c',
         'varnish3'        => 'c',
+        'vcl'             => 'c',
     ];
 
     /** @var CodeNode */