Update .godocdown.tmpl

Author: ajeetdsouza

.godocdown.tmpl

@@ -4,7 +4,7 @@
 [![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)](LICENSE.md)
 ![GitHub Actions](https://github.com/avast/retry-go/actions/workflows/workflow.yaml/badge.svg)
 [![Go Report Card](https://goreportcard.com/badge/github.com/avast/retry-go?style=flat-square)](https://goreportcard.com/report/github.com/avast/retry-go)
-[![GoDoc](https://godoc.org/github.com/avast/retry-go?status.svg&style=flat-square)](http://godoc.org/github.com/avast/retry-go)
+[![Go Reference](https://pkg.go.dev/badge/github.com/avast/retry-go/v4.svg)](https://pkg.go.dev/github.com/avast/retry-go/v4)
 [![codecov.io](https://codecov.io/github/avast/retry-go/coverage.svg?branch=master)](https://codecov.io/github/avast/retry-go?branch=master)
 [![Sourcegraph](https://sourcegraph.com/github.com/avast/retry-go/-/badge.svg)](https://sourcegraph.com/github.com/avast/retry-go?badge)