LuMultipleDbo map function

src/Utils/LuMultipleDbo.php

         $this->_count = $count;
         $this->_data = $data;
     }
+
+    function map(callable $callback)
+    {
+        $values = [];
+        foreach ($this->_data as $data) {
+            $values = $callback($data);
+        }
+        return new LuMultipleDbo($this->_count, $values);
+    }
 }