Fix Travis test

Author: ivanlanin

tests/PhpWord/Tests/Writer/Word2007/Part/DocumentTest.php

@@ -68,6 +68,7 @@ public function testElements()
         $section = $phpWord->addSection();
         $section->addTOC();
         $section->addPageBreak();
+        $section->addText('After page break.');
         $section->addTitle('Title 1', 1);
         $section->addListItem('List Item 1', 0);
         $section->addListItem('List Item 2', 0);