Update README.md

Signed-off-by: 顾真牛 <[email protected]>

README.md

@@ -7,7 +7,7 @@
 <div align="center"> 
 
 ![license](https://shields.io/badge/license-MIT%2FApache--2.0-blue)
-[![Rust Version](https://img.shields.io/badge/Rust-1.75.0+-blue)](https://releases.rs/docs/1.75.0)
+[![Rust Version](https://img.shields.io/badge/Rust-1.78.0+-blue)](https://releases.rs/docs/1.75.0)
 ![PRs welcome](https://img.shields.io/badge/PRs-Welcome-brightgreen)     
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
 [![All Contributors](https://img.shields.io/badge/all_contributors-7-orange.svg?style=flat-square)](#contributors-)