Add new Symfony directory structure in driver

This fix #370

Author: mayeco

cli/drivers/SymfonyValetDriver.php

@@ -13,7 +13,9 @@ class SymfonyValetDriver extends ValetDriver
     public function serves($sitePath, $siteName, $uri)
     {
         return (file_exists($sitePath.'/web/app_dev.php') || file_exists($sitePath.'/web/app.php')) &&
-               (file_exists($sitePath.'/app/AppKernel.php'));
+               (file_exists($sitePath.'/app/AppKernel.php')) || (file_exists($sitePath.'/web/index.php')) &&
+               (file_exists($sitePath.'/src/Kernel.php'))
+            ;
     }
 
     /**
@@ -47,6 +49,8 @@ public function frontControllerPath($sitePath, $siteName, $uri)
             return $frontControllerPath;
         } elseif (file_exists($frontControllerPath = $sitePath.'/web/app.php')) {
             return $frontControllerPath;
+        } elseif (file_exists($frontControllerPath = $sitePath.'/web/index.php')) {
+            return $frontControllerPath;
         }
     }
 }