Update README.md

Author: ChrisRackauckas

README.md

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 # ModelingToolkit.jl
 
-[![Build Status](https://github.com/SciML/ModelingToolkit.jl/workflows/CI/badge.svg)](https://github.com/SciML/ModelingToolkit.jl/actions?query=workflow%3ACI)
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 [![Github Action CI](https://github.com/SciML/ModelingToolkit.jl/workflows/CI/badge.svg)](https://github.com/SciML/ModelingToolkit.jl/actions)
 [![Coverage Status](https://coveralls.io/repos/github/SciML/ModelingToolkit.jl/badge.svg?branch=master)](https://coveralls.io/github/SciML/ModelingToolkit.jl?branch=master)
 [![Stable](https://img.shields.io/badge/docs-stable-blue.svg)](http://mtk.sciml.ai/stable/)