Fix CI badge

Author: simsurace

README.md

@@ -1,6 +1,6 @@
 # GraphPlot
 
-![CI](https://github.com/JuliaGraphs/GraphPlot.jl/workflows/CI/badge.svg?branch=master)
+[![CI](https://github.com/JuliaGraphs/GraphPlot.jl/actions/workflows/ci.yml/badge.svg)](https://github.com/JuliaGraphs/GraphPlot.jl/actions/workflows/ci.yml)
 [![version](https://juliahub.com/docs/GraphPlot/version.svg)](https://juliahub.com/ui/Packages/GraphPlot/bUwXr)
 
 Graph layout and visualization algorithms based on [Compose.jl](https://github.com/dcjones/Compose.jl) and inspired by [GraphLayout.jl](https://github.com/IainNZ/GraphLayout.jl).