chore: update readme

README.md

@@ -1,11 +1,11 @@
-# Dufs
+# Dufs (Old Name: Duf)
 
 [![CI](https://github.com/sigoden/dufs/actions/workflows/ci.yaml/badge.svg)](https://github.com/sigoden/dufs/actions/workflows/ci.yaml)
 [![Crates](https://img.shields.io/crates/v/dufs.svg)](https://crates.io/crates/dufs)
 
 Dufs is a simple file server. Support static serve, search, upload, webdav...
 
-![demo](https://user-images.githubusercontent.com/4012553/171526189-09afc2de-793f-4216-b3d5-31ea408d3610.png)
+![demo](https://user-images.githubusercontent.com/4012553/174486522-7af350e6-0195-4f4a-8480-d9464fc6452f.png)
 
 ## Features