Updated the readme to point to pkg.dev

Author: AchoArnold

README.md

@@ -3,7 +3,7 @@ Testify - Thou Shalt Write Tests
 
 ℹ️ We are working on testify v2 and would love to hear what you'd like to see in it, have your say here: https://cutt.ly/testify
 
-[![Build Status](https://travis-ci.org/stretchr/testify.svg)](https://travis-ci.org/stretchr/testify) [![Go Report Card](https://goreportcard.com/badge/github.com/stretchr/testify)](https://goreportcard.com/report/github.com/stretchr/testify) [![GoDoc](https://godoc.org/github.com/stretchr/testify?status.svg)](https://godoc.org/github.com/stretchr/testify)
+[![Build Status](https://travis-ci.org/stretchr/testify.svg)](https://travis-ci.org/stretchr/testify) [![Go Report Card](https://goreportcard.com/badge/github.com/stretchr/testify)](https://goreportcard.com/report/github.com/stretchr/testify) [![PkgGoDev](https://pkg.go.dev/badge/github.com/stretchr/testify/assert)](https://pkg.go.dev/github.com/stretchr/testify/assert)
 
 Go code (golang) set of packages that provide many tools for testifying that your code will behave as you intend.