✨ mica-mqtt-core 添加客户端是否断开连接。

mica-mqtt-core/src/main/java/net/dreamlu/iot/mqtt/core/client/MqttClient.java

@@ -308,7 +308,7 @@ public final class MqttClient {
 	 *
 	 * @return 是否断连
 	 */
-	public boolean isDisconnect() {
+	public boolean isDisconnected() {
 		return context.isClosed;
 	}