docs: update README

README-zh.md

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 </div>
 
-# Luckysheet 3.x 已更名为 [Univer](https://github.com/dream-num/univer)
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 简体中文 | [English](./README.md)
 
+# Luckysheet 已不再维护，推荐使用 [Univer](https://github.com/dream-num/univer) 替代
+
+点击 [#1454](https://github.com/dream-num/Luckysheet/issues/1454) 查看更多详情。
+
+
 ## 介绍
 🚀Luckysheet ，一款纯前端类似excel的在线表格，功能强大、配置简单、完全开源。
 

README.md

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 </div>
 
-# Luckysheet 3.x has been renamed to [Univer](https://github.com/dream-num/univer)
-
 English| [简体中文](./README-zh.md)
 
+# Luckysheet is no longer maintained, please use [Univer](https://github.com/dream-num/univer) instead!
+
+Follow the [#1454](https://github.com/dream-num/Luckysheet/issues/1454) issue for more details.
+
 ## Introduction
 🚀Luckysheet is an online spreadsheet like excel that is powerful, simple to configure, and completely open source.