code: def ssh_keys(self):
          
          params = {}
          json = self.request('/ssh_keys', method='GET', params=params)
          status = json.get('status')
          if status == 'OK':
              ssh_keys_json = json.get('ssh_keys', [])
              keys = [SSHKey.from_json(ssh_key) for ssh_key in ssh_keys_json]
              return keys
          else:
              message = json.get('message')
              raise DOPException('[%s]: %s' % (status, message))
docs: This method lists all the available public SSH keys in your account
          that can be added to a droplet.