README: change GoDoc badge to pkg.go.dev

Author: zchee

README.md

@@ -1,5 +1,5 @@
-[![GoDoc](https://godoc.org/github.com/neovim/go-client?status.svg)](https://godoc.org/github.com/neovim/go-client)
 [![Github Actions](https://github.com/neovim/go-client/workflows/Test/badge.svg?branch=master)](https://github.com/neovim/go-client/actions)
+[![pkg.go.dev](https://bit.ly/pkg-go-dev-flat)](https://pkg.go.dev/github.com/neovim/go-client)
 
 Neovim/go-client is a [Neovim](https://neovim.io/) client and plugin host for [Go](https://golang.org/).