Migrate from godoc.org to pkg.go.dev

Author: johejo

README.md

@@ -2,7 +2,7 @@
 
 [![codecov](https://codecov.io/gh/mattn/go-shellwords/branch/master/graph/badge.svg)](https://codecov.io/gh/mattn/go-shellwords)
 [![Build Status](https://travis-ci.org/mattn/go-shellwords.svg?branch=master)](https://travis-ci.org/mattn/go-shellwords)
-[![GoDoc](https://godoc.org/github.com/mattn/go-shellwords?status.svg)](http://godoc.org/github.com/mattn/go-shellwords)
+[![PkgGoDev](https://pkg.go.dev/badge/github.com/mattn/go-shellwords)](https://pkg.go.dev/github.com/mattn/go-shellwords)
 [![ci](https://github.com/mattn/go-shellwords/ci/badge.svg)](https://github.com/mattn/go-shellwords/actions)
 
 Parse line as shell words.