会议事件添加时间戳

common/src/main/java/cn/wildfirechat/pojos/ConferenceUnpublishEvent.java

@@ -4,4 +4,9 @@ public class ConferenceUnpublishEvent {
     public String userId;
     public String roomId;
     public boolean screenSharing;
+    public long timestamp;
+
+    public ConferenceUnpublishEvent() {
+        timestamp = System.currentTimeMillis();
+    }
 }