def start(self, subid, params=None):
        ''' /v1/server/start
        POST - account
        Start a virtual machine. If the machine is already
        running, it will be restarted.

        Link: https://www.vultr.com/api/#server_start
        '''
        params = update_params(params, {'SUBID': subid})
        return self.request('/v1/server/start', params, 'POST')
/v1/server/start
        POST - account
        Start a virtual machine. If the machine is already
        running, it will be restarted.

        Link: https://www.vultr.com/api/#server_start