Fix GitHub actions badge in README (#3907)

README.md

@@ -19,7 +19,7 @@ visiting [jump.dev](https://jump.dev).
 | Documentation | [![stable](https://img.shields.io/badge/docs-stable-blue.svg)](https://jump.dev/JuMP.jl/stable/) | [![dev](https://img.shields.io/badge/docs-dev-blue.svg)](https://jump.dev/JuMP.jl/dev/) |
 | Get help | Ask a question on the [Community forum](https://jump.dev/forum) | Join the [Developer chatroom](https://jump.dev/chatroom) |
 | Source code  | [release-1.0](https://github.com/jump-dev/JuMP.jl/tree/release-1.0) | [master](https://github.com/jump-dev/JuMP.jl/tree/master) |
-| Testing status | [![Build Status](https://github.com/jump-dev/JuMP.jl/workflows/CI/badge.svg?branch=release-1.0)](https://github.com/jump-dev/JuMP.jl/actions?query=workflow%3ACI) | [![Build Status](https://github.com/jump-dev/JuMP.jl/workflows/CI/badge.svg?branch=master)](https://github.com/jump-dev/JuMP.jl/actions?query=workflow%3ACI) |
+| Testing status | [![Build Status](https://github.com/jump-dev/JuMP.jl/actions/workflows/ci.yml/badge.svg?branch=release-1.0)](https://github.com/jump-dev/JuMP.jl/actions?query=workflow%3ACI) | [![Build Status](https://github.com/jump-dev/JuMP.jl/actions/workflows/ci.yml/badge.svg?branch=master)](https://github.com/jump-dev/JuMP.jl/actions?query=workflow%3ACI) |
 | Coverage | [![codecov](https://codecov.io/gh/jump-dev/JuMP.jl/branch/release-1.0/graph/badge.svg)](https://codecov.io/gh/jump-dev/JuMP.jl) | [![codecov](https://codecov.io/gh/jump-dev/JuMP.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/jump-dev/JuMP.jl) |
 
 ## Need help?