Update README.md - fix build status badge

README.md

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 # musegpt
 
-[![CMake](https://github.com/greynewell/musegpt/actions/workflows/cmake.yml/badge.svg)](https://github.com/greynewell/musegpt/actions/workflows/cmake.yml)[![License: AGPL v3](https://img.shields.io/badge/License-AGPL%20v3-blue.svg)](https://www.gnu.org/licenses/agpl-3.0) [![Platform Support](https://img.shields.io/badge/platform-Windows%20%7C%20macOS%20%7C%20Linux-blue)](#supported-platforms) [![C++](https://img.shields.io/badge/c++-17-%2300599C.svg?logo=c%2B%2B&logoColor=white)](https://isocpp.org/) [![JUCE](https://img.shields.io/badge/JUCE-8-8DC63F&logo=juce&logoColor=white)](https://juce.com/) [![llama.cpp](https://img.shields.io/badge/llama.cpp-feff4aa-violet&logoColor=white)](https://github.com/ggerganov/llama.cpp/commit/feff4aa8461da7c432d144c11da4802e41fef3cf)
+[![CMake](https://github.com/greynewell/musegpt/actions/workflows/cmake.yml/badge.svg?branch=main)](https://github.com/greynewell/musegpt/actions/workflows/cmake.yml) [![License: AGPL v3](https://img.shields.io/badge/License-AGPL%20v3-blue.svg)](https://www.gnu.org/licenses/agpl-3.0) [![Platform Support](https://img.shields.io/badge/platform-Windows%20%7C%20macOS%20%7C%20Linux-blue)](#supported-platforms) [![C++](https://img.shields.io/badge/c++-17-%2300599C.svg?logo=c%2B%2B&logoColor=white)](https://isocpp.org/) [![JUCE](https://img.shields.io/badge/JUCE-8-8DC63F&logo=juce&logoColor=white)](https://juce.com/) [![llama.cpp](https://img.shields.io/badge/llama.cpp-feff4aa-violet&logoColor=white)](https://github.com/ggerganov/llama.cpp/commit/feff4aa8461da7c432d144c11da4802e41fef3cf)
 
 Run local Large Language Models (LLMs) in your Digital Audio Workstation (DAW) to create music.