Update README.md

README.md

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 OpenUtau is a free, open-source editor made for the UTAU community.
 
-[![AppVeyor](https://img.shields.io/appveyor/build/stakira/OpenUtau?style=for-the-badge&label=appveyor&logo=appveyor)](https://ci.appveyor.com/project/stakira/openutau)
+[![Build](https://img.shields.io/github/actions/workflow/status/stakira/OpenUtau/build.yml?style=for-the-badge)](https://github.com/stakira/OpenUtau/actions/workflows/build.yml)
 [![Discord](https://img.shields.io/discord/551606189386104834?style=for-the-badge&label=discord&logo=discord&logoColor=ffffff&color=7389D8&labelColor=6A7EC2)](https://discord.gg/UfpMnqMmEM)
 [![QQ Qroup](https://img.shields.io/badge/QQ-485658015-blue?style=for-the-badge)](https://qm.qq.com/cgi-bin/qm/qr?k=8EtEpehB1a-nfTNAnngTVqX3o9xoIxmT&jump_from=webapi)
 [![Trello](https://img.shields.io/badge/trello-go-blue?style=for-the-badge&logo=trello)](https://trello.com/b/93ANoCIV/openutau)