Update README.md

Snailclimb · Snailclimb · commit f2c3a98c5fe9 · 2020-11-28T21:34:02.000+08:00
diff --git a/README.md b/README.md
@@ -212,7 +212,6 @@
 
 ### Redis
 
-1. [关于缓存的一些重要概念(Redis 前置菜)](docs/database/Redis/some-concepts-of-caching.md)
 2. [Redis 常见问题总结](docs/database/Redis/redis-all.md)
 
 ## 系统设计
