Footnote should be allowed within ListItemRun

[rootpd]

This is:

• a bug report
• a feature request
• not a usage question (ask them on https://stackoverflow.com/questions/tagged/phpword)

Expected Behavior

Library should allow creating Footnote within ListItemRun.

Current Behavior

BadMethodCallException is being thrown from PhpOffice\PhpWord\Element\AbstractContainer

How to Reproduce

<?php
require __DIR__ . '/vendor/autoload.php';

$phpWord = new \PhpOffice\PhpWord\PhpWord();
$section = $phpWord->addSection();
$liRun = $section->addListItemRun(0, ['listType' => \PhpOffice\PhpWord\Style\ListItem::TYPE_NUMBER]);
$liRun->addText('foo');
$fn = $liRun->addFootnote();
$fn->addText($footnote);

I've tried to comment the thrown exception. Generated word is valid and displaying correctly. This is solely to revise allowed containers for footnote container.

Thank you.

Context

• PHP version: 7.1
• PHPWord version: 0.14

[troosan]

all you need to change is the AbstractContainer

            'Footnote'      => array('Section', 'TextRun', 'Cell', 'ListItemRun'),

I'll create a PR for it.