Question: how to close the websocket connection? #431

@Configuration
public class WebSocketConfig {
	@Autowired
	OperationParametersDTO operationParametersDTO;
	@Bean
	public BinanceApiWebSocketClient binanceApiWebSocketClient() {
		BinanceApiWebSocketClient bean = BinanceApiClientFactory.newInstance().newWebSocketClient();
		bean.onCandlestickEvent(operationParametersDTO.getOperationPair().toLowerCase(),
                CandlestickInterval.ONE_MINUTE,
                new BinanceApiCallback<CandlestickEvent>() {	
					@Override
					public void onResponse(CandlestickEvent ce) {
						System.out.println(ce);
					}
				}
		);
		return bean;
	}
}

`
// ... closer controller logic
binanceApiWebSocketClient.close();
binanceApiWebSocketClient = null;
//... closer controller logic
`