适配xchat-client 2.2.2

xim/xim.ts

@@ -320,6 +320,11 @@ export class Xim {
         return this.client?.syncReadMsg(chatId, start_msg_id, end_msg_id);
     }
 
+    // xchat-client 2.2.2新增
+    public setUnRead(chatId: number) {
+        return this.client?.unreadChat(chatId);
+    }
+
     private parseEventListener(...args: any[]): [string, Function] {
         if (args.length < 2) {
             throw new Error("参数个数不正确");