List the stocks available for trading on the venue.

        https://starfighter.readme.io/docs/list-stocks-on-venue

def venue_stocks(self):
        """List the stocks available for trading on the venue.

        https://starfighter.readme.io/docs/list-stocks-on-venue
        """
        url = urljoin(self.base_url, 'venues/{0}/stocks'.format(self.venue))
        return self.session.get(url).json()