Add PkgEval badge to Readme (#582)

Author: jishnub

README.md

@@ -1,14 +1,16 @@
 # ApproxFunBase.jl
 Core functionality of ApproxFun
 
-[![](https://img.shields.io/badge/docs-stable-blue.svg)](https://JuliaApproximation.github.io/ApproxFun.jl/stable)
-[![](https://img.shields.io/badge/docs-dev-blue.svg)](https://JuliaApproximation.github.io/ApproxFun.jl/dev)
 [![CI](https://github.com/JuliaApproximation/ApproxFunBase.jl/actions/workflows/ci.yml/badge.svg)](https://github.com/JuliaApproximation/ApproxFunBase.jl/actions/workflows/ci.yml)
 [![IntegrationTest](https://github.com/JuliaApproximation/ApproxFunBase.jl/actions/workflows/downstream.yml/badge.svg)](https://github.com/JuliaApproximation/ApproxFunBase.jl/actions/workflows/downstream.yml)
 [![codecov](https://codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/JuliaApproximation/ApproxFunBase.jl)
 [![Aqua QA](https://raw.githubusercontent.com/JuliaTesting/Aqua.jl/master/badge.svg)](https://github.com/JuliaTesting/Aqua.jl)
 [![deps](https://juliahub.com/docs/ApproxFunBase/deps.svg)](https://juliahub.com/ui/Packages/ApproxFunBase/deO92?t=2)
 [![version](https://juliahub.com/docs/ApproxFunBase/version.svg)](https://juliahub.com/ui/Packages/ApproxFunBase/deO92)
+[![pkgeval](https://juliahub.com/docs/General/ApproxFunBase/stable/pkgeval.svg)](https://juliahub.com/ui/Packages/General/ApproxFunBase)
+
+[![](https://img.shields.io/badge/docs-stable-blue.svg)](https://JuliaApproximation.github.io/ApproxFun.jl/stable)
+[![](https://img.shields.io/badge/docs-dev-blue.svg)](https://JuliaApproximation.github.io/ApproxFun.jl/dev)
 [![Join the chat at https://gitter.im/JuliaApproximation/ApproxFun.jl](https://badges.gitter.im/JuliaApproximation/ApproxFun.jl.svg)](https://gitter.im/JuliaApproximation/ApproxFun.jl?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)