Body not required to create an issue

[bobeagan]

https://developer.github.com/v3/issues/#create-an-issue shows that only title is required.

php-github-api/lib/Github/Api/Issue.php

Lines 130 to 137 in 22319ee

	public function create($username, $repository, array $params)
	{
	if (!isset($params['title'], $params['body'])) {
	throw new MissingArgumentException(array('title', 'body'));
	}
	return $this->post('/repos/'.rawurlencode($username).'/'.rawurlencode($repository).'/issues', $params);
	}