Update badge link in.

Author: csyonghe

README.md

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 Slang
 =====
-![Linux Build Status](https://github.com/shader-slang/slang/actions/workflows/linux.yml/badge.svg)
-![Windows Build Status](https://github.com/shader-slang/slang/actions/workflows/windows.yml/badge.svg)
-![macOS Build Status](https://github.com/shader-slang/slang/actions/workflows/macos.yml/badge.svg)
+![CI Status](https://github.com/shader-slang/slang/actions/workflows/ci.yml/badge.svg?branch=master)
 ![CTS Status](https://github.com/shader-slang/slang/actions/workflows/vk-gl-cts-nightly.yml/badge.svg)
 
 Slang is a shading language that makes it easier to build and maintain large shader codebases in a modular and extensible fashion, while also maintaining the highest possible performance on modern GPUs and graphics APIs.