Merge pull request #438 from franzholz/patch-2

Update Table.php: Always close th as th

Author: Progi1984

src/PhpWord/Writer/HTML/Element/Table.php

@@ -51,7 +51,7 @@ public function write()
                     $cellTag = $tblHeader ? 'th' : 'td';
                     $content .= "<{$cellTag}>" . PHP_EOL;
                     $content .= $writer->write();
-                    $content .= '</td>' . PHP_EOL;
+                    $content .= "</{$cellTag}>" . PHP_EOL;
                 }
                 $content .= '</tr>' . PHP_EOL;
             }