Move Cell and Options to Entity folder (#429)

src/Spout/Writer/WriterAbstract.php

@@ -7,7 +7,7 @@ use Box\Spout\Common\Exception\IOException;
 use Box\Spout\Common\Exception\SpoutException;
 use Box\Spout\Common\Helper\FileSystemHelper;
 use Box\Spout\Writer\Manager\OptionsManagerInterface;
-use Box\Spout\Writer\Common\Options;
+use Box\Spout\Writer\Entity\Options;
 use Box\Spout\Writer\Exception\WriterAlreadyOpenedException;
 use Box\Spout\Writer\Exception\WriterNotOpenedException;