修改readme

sheng-jie · sheng-jie · commit a157148cd726 · 2017-03-11T22:01:21.000+08:00
diff --git a/README.md b/README.md
@@ -49,4 +49,6 @@
 
 18. [ATM取款聊聊『门面模式』](http://www.jianshu.com/p/c89a922a60c0)
 
+19. [后悔药，『备忘录模式』](http://www.jianshu.com/p/6d46b5d3fdee)
+
 ![设计模式之禅](http://upload-images.jianshu.io/upload_images/2799767-4df489c0f630a241.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
