Merge pull request #727 from guilhem/patch-1

🏃 add go reference badge

README.md

@@ -1,3 +1,4 @@
+[![Go Reference](https://pkg.go.dev/badge/sigs.k8s.io/controller-tools.svg)](https://pkg.go.dev/sigs.k8s.io/controller-tools)
 [![Build Status](https://travis-ci.org/kubernetes-sigs/controller-tools.svg?branch=master)](https://travis-ci.org/kubernetes-sigs/controller-tools "Travis")
 [![Go Report Card](https://goreportcard.com/badge/sigs.k8s.io/controller-tools)](https://goreportcard.com/report/sigs.k8s.io/controller-tools)