chore: fix the shield.io badge

README.md

@@ -4,7 +4,7 @@
 
 [![GitHub stars](https://img.shields.io/github/stars/rapiz1/rathole)](https://github.com/rapiz1/rathole/stargazers)
 [![GitHub release (latest SemVer)](https://img.shields.io/github/v/release/rapiz1/rathole)](https://github.com/rapiz1/rathole/releases)
-![GitHub Workflow Status (branch)](https://img.shields.io/github/workflow/status/rapiz1/rathole/Rust/main)
+![GitHub Workflow Status (branch)](https://img.shields.io/github/actions/workflow/status/rapiz1/rathole/rust.yml?branch=main)
 [![GitHub all releases](https://img.shields.io/github/downloads/rapiz1/rathole/total)](https://github.com/rapiz1/rathole/releases)
 [![Docker Pulls](https://img.shields.io/docker/pulls/rapiz1/rathole)](https://hub.docker.com/r/rapiz1/rathole)
 [![Join the chat at https://gitter.im/rapiz1/rathole](https://badges.gitter.im/rapiz1/rathole.svg)](https://gitter.im/rapiz1/rathole?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)