Add raw method to Db class for query expressions

Author: walkor

src/support/Db.php

@@ -16,6 +16,7 @@
 
 use Closure;
 use Webman\Database\Manager;
+use Illuminate\Contracts\Database\Query\Expression;
 
 require_once __DIR__ . '/../Initializer.php';
 
@@ -31,8 +32,9 @@
  * @method static void beginTransaction()
  * @method static void rollBack($toLevel = null)
  * @method static void commit()
+ * @method static Expression raw(mixed $value)
  */
 class Db extends Manager
 {
 
-}
+}