use ColPrac

Author: oxinabox

README.md

@@ -1,5 +1,6 @@
 # Mjolnir
 
+[![ColPrac: Contributor's Guide on Collaborative Practices for Community Packages](https://img.shields.io/badge/ColPrac-Contributor's%20Guide-blueviolet)](https://github.com/SciML/ColPrac)
 [![Build Status](https://travis-ci.org/MikeInnes/Mjolnir.jl.svg?branch=master)](https://travis-ci.org/MikeInnes/Mjolnir.jl)
 
 Mjolnir is a hybrid approach to partial evaluation / abstract interpretation,