'Add labels to this issue.
:param str args: (required), names of the labels you wish to add
:returns: list of :class:`Label`\ s'

@requires_auth
def add_labels(self, *args):

    url = self._build_url(u'labels', base_url=self._api)
    json = self._json(self._post(url, data=args), 200)
    return ([Label(l, self) for l in json] if json else [])
