Retrieve list of followers of given profile.
        To use this, one needs to be logged in and private profiles has to be followed.

def get_followers(self) -> Iterator['Profile']:
        """
        Retrieve list of followers of given profile.
        To use this, one needs to be logged in and private profiles has to be followed.
        """
        if not self._context.is_logged_in:
            raise LoginRequiredException("--login required to get a profile's followers.")
        self._obtain_metadata()
        yield from (Profile(self._context, node) for node in
                    self._context.graphql_node_list("37479f2b8209594dde7facb0d904896a",
                                                    {'id': str(self.userid)},
                                                    'https://www.instagram.com/' + self.username + '/',
                                                    lambda d: d['data']['user']['edge_followed_by'],
                                                    self._rhx_gis))