Update README.md

NintenSAGA · NintenSAGA · commit bb9a906abd7c · 2022-05-24T15:49:00.000+08:00
diff --git a/README.md b/README.md
@@ -323,7 +323,7 @@ HttpServer 与 HttpClient 均采用 Java NIO.2 模型进行开发，使用了 `j
 
 
 ```java
-main/
+main
 ├── java
 │   └── edu.nju.http
 │        ├── client  /* Client Package */
