Add NanosoldierReports badge (#147)

Author: nickrobinson251

README.md

@@ -4,6 +4,7 @@
 
 [![Travis](https://travis-ci.org/JuliaDiff/ChainRules.jl.svg?branch=master)](https://travis-ci.org/JuliaDiff/ChainRules.jl)
 [![Coveralls](https://coveralls.io/repos/github/JuliaDiff/ChainRules.jl/badge.svg?branch=master)](https://coveralls.io/github/JuliaDiff/ChainRules.jl?branch=master)
+[![PkgEval](https://juliaci.github.io/NanosoldierReports/pkgeval_badges/C/ChainRules.svg)](https://juliaci.github.io/NanosoldierReports/pkgeval_badges/report.html)
 
 **Docs:**
 [![](https://img.shields.io/badge/docs-master-blue.svg)](https://JuliaDiff.github.io/ChainRules.jl/dev)