Merge pull request #6 from tomaszbrunarski/master

fix for "Object" reserved keyword on ColumnValueMapper

src/mappers/ColumnValueMapper.php

@@ -10,7 +10,6 @@
 namespace dosamigos\exportable\mappers;
 
 use yii\base\Model;
-use yii\base\Object;
 use yii\db\ActiveRecordInterface;
 use yii\grid\ActionColumn;
 use yii\grid\CheckboxColumn;

src/services/ExportableService.php

@@ -34,6 +34,7 @@ public function run(GridView $grid, $type, array $columns, $filename)
         $writer = WriterFactory::create($type);
 
         $this->clearBuffers();
+        ob_start();
         $writer->openToBrowser($filename);
         if ($model !== null && !in_array($type, [TypeHelper::JSON, TypeHelper::XML])) {
             $writer->addRow($mapper->getHeaders($model));