Add Codecov badge

README.md

@@ -3,7 +3,7 @@
 [![Build Status](https://github.com/Gnimuc/CImGui.jl/workflows/CI/badge.svg)](https://github.com/Gnimuc/CImGui.jl/actions/workflows/ci.yml)
 [![pkgeval](https://juliahub.com/docs/CImGui/pkgeval.svg)](https://juliahub.com/ui/Packages/CImGui/HqG2H)
 [![version](https://juliahub.com/docs/CImGui/version.svg)](https://juliahub.com/ui/Packages/CImGui/HqG2H)
-<!---[![Codecov](https://codecov.io/gh/Gnimuc/CImGui.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/Gnimuc/CImGui.jl)--->
+[![codecov](https://codecov.io/gh/Gnimuc/CImGui.jl/graph/badge.svg?token=KLCkl2pB7N)](https://codecov.io/gh/Gnimuc/CImGui.jl)
 [![](https://img.shields.io/badge/design%20principle-KISS-orange)](https://en.wikipedia.org/wiki/KISS_principle)
 [![](https://img.shields.io/badge/docs-stable-blue.svg)](https://Gnimuc.github.io/CImGui.jl/stable)
 [![](https://img.shields.io/badge/docs-dev-blue.svg)](https://Gnimuc.github.io/CImGui.jl/dev)