'Reply to this review comment with a new review comment.
:param str body: The text of the comment.
:returns: The created review comment.
:rtype: :class:`~github3.pulls.ReviewComment`'

@requires_auth
def reply(self, body):

    url = self._build_url(u'comments', base_url=self.pull_request_url)
    index = (self._api.rfind(u'/') + 1)
    in_reply_to = self._api[index:]
    json = self._json(self._post(url, data={u'body': body, u'in_reply_to': in_reply_to}), 201)
    return self._instance_or_null(ReviewComment, json)
