rm flaky codecove badge

50% of the time the badge reports the wrong number

Author: baggepinnen

README.md

@@ -1,15 +1,12 @@
 # ControlSystems.jl
 
-[![Build Status](https://github.com/JuliaControl/ControlSystems.jl/workflows/CI/badge.svg)](https://github.com/JuliaControl/ControlSystems.jl/actions?query=workflow%3ACI)
-[![Documentation Status](https://github.com/JuliaControl/ControlSystems.jl/workflows/Docs/badge.svg)](https://github.com/JuliaControl/ControlSystems.jl/actions?query=workflow%3ADocs)
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-[![PkgEval](https://juliaci.github.io/NanosoldierReports/pkgeval_badges/C/ControlSystems.svg)](https://juliaci.github.io/NanosoldierReports/pkgeval_badges/report.html)
-[![codecov](https://codecov.io/gh/JuliaControl/ControlSystems.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/JuliaControl/ControlSystems.jl)
-
 [![](https://img.shields.io/badge/docs-stable-blue.svg)](https://juliacontrol.github.io/ControlSystems.jl/stable)
 [![](https://img.shields.io/badge/docs-latest-blue.svg)](https://juliacontrol.github.io/ControlSystems.jl/dev)
 [![Star on GitHub](https://img.shields.io/github/stars/JuliaControl/ControlSystems.jl.svg?style=social)](https://github.com/JuliaControl/ControlSystems.jl/stargazers)
 
+[![Build Status](https://github.com/JuliaControl/ControlSystems.jl/workflows/CI/badge.svg)](https://github.com/JuliaControl/ControlSystems.jl/actions?query=workflow%3ACI)
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 A control systems design toolbox for Julia.
 
 ## Installation