Add use PhpOffice\PhpSpreadsheet\Spreadsheet;

Author: dgeppo

tests/PhpSpreadsheetTests/CommentTest.php

@@ -5,6 +5,7 @@
 use PhpOffice\PhpSpreadsheet\Comment;
 use PhpOffice\PhpSpreadsheet\RichText\RichText;
 use PhpOffice\PhpSpreadsheet\RichText\TextElement;
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
 use PhpOffice\PhpSpreadsheet\Style\Alignment;
 use PhpOffice\PhpSpreadsheet\Style\Color;
 use PHPUnit\Framework\TestCase;