chore: update build status badge [ci skip]

README.md

@@ -1,4 +1,4 @@
-# vue-next [![beta](https://img.shields.io/npm/v/vue/next.svg)](https://www.npmjs.com/package/vue/v/next) [![CircleCI](https://circleci.com/gh/vuejs/vue-next.svg?style=svg&circle-token=fb883a2d0a73df46e80b2e79fd430959d8f2b488)](https://circleci.com/gh/vuejs/vue-next)
+# vue-next [![npm](https://img.shields.io/npm/v/vue/next.svg)](https://www.npmjs.com/package/vue/v/next) [![build status](https://github.com/vuejs/vue-next/actions/workflows/ci.yml/badge.svg?branch=master)](https://github.com/vuejs/vue-next/actions/workflows/ci.yml)
 
 This is the repository for Vue 3.0.