Update README.md

Author: ChrisRackauckas

README.md

@@ -1,7 +1,7 @@
 # DiffEqBase.jl
 
 [![Join the chat at https://gitter.im/JuliaDiffEq/Lobby](https://badges.gitter.im/JuliaDiffEq/Lobby.svg)](https://gitter.im/JuliaDiffEq/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
-[![Build Status](https://github.com/SciML/DiffEqBase.jl/workflows/CI/badge.svg)](https://github.com/SciML/DiffEqBase.jl/actions?query=workflow%3ACI)
+[![Build Status](https://github.com/SciML/DiffEqBase.jl/workflows/Tests/badge.svg)](https://github.com/SciML/DiffEqBase.jl/actions?query=workflow%3ATests)
 [![Build status](https://badge.buildkite.com/99cbd352c336779c3117e4da61255a1ed8e7e7c084c3c2516c.svg)](https://buildkite.com/julialang/diffeqbase-dot-jl)
 
 DiffEqBase.jl is a component package in the DiffEq ecosystem. It holds the