Returns the closest regions for the supplied lat/lon.

def trends_closest(self, lat, lon):
        """
        Returns the closest regions for the supplied lat/lon.
        """
        url = 'https://api.twitter.com/1.1/trends/closest.json'
        params = {'lat': lat, 'long': lon}
        try:
            resp = self.get(url, params=params)
        except requests.exceptions.HTTPError as e:
            raise e
        return resp.json()