update readme

panlinlin

2020-12-19 cebea64d36bac571aa72b0f19cf3d7955175e959

 src/main/java/com/genersoft/iot/vmp/vmanager/playback/PlaybackController.java

@@ -72,7 +72,7 @@
      StreamInfo streamInfo = storager.queryPlaybackByDevice(deviceId, channelId);
      if (streamInfo != null) {
         // 停止之前的回放
         cmder.streamByeCmd(streamInfo.getSsrc());
         cmder.streamByeCmd(streamInfo.getStreamId());
      }
      resultHolder.put(DeferredResultHolder.CALLBACK_CMD_PlAY + uuid, result);
      cmder.playbackStreamCmd(device, channelId, startTime, endTime, (JSONObject response) -> {