添加出版推广

README.md

@@ -16,6 +16,10 @@ English version repo and Gitbook is on [english branch](https://github.com/labul
 
 ![](pictures/souyisou.png)
 
+好消息，《labuladong 的算法小抄》出版啦！扫码查看详情，12 月 6 日晚上 12:00 之前限时五折，附赠力扣会员优惠券，扫码即可查看详情👇
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+![图书二维码](https://i.loli.net/2020/12/03/xXKBpqGzI6ol985.jpg)
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 <p align='center'>
 <img src="https://gitee.com/labuladong/pictures/raw/master/starHistory.png" width = "600" />
 </p>