Added constructor for RenameOperation.

Signed-off-by: Dan Ungureanu <udan1107@gmail.com>

Author: udan11

src/Components/RenameOperation.php

@@ -34,6 +34,18 @@ class RenameOperation extends Component
      */
     public $new;
 
+    /**
+     * Constructor.
+     *
+     * @param Expression $old Old expression.
+     * @param Expression $new New expression containing new name.
+     */
+    public function __construct($old = null, $new = null)
+    {
+        $this->old = $old;
+        $this->new = $new;
+    }
+
     /**
      * @param Parser     $parser  the parser that serves as context
      * @param TokensList $list    the list of tokens that are being parsed