Update godoc link to pkg.go.dev

[SKIP CI]

README.md

@@ -1,6 +1,6 @@
 # Clog 
 
-[![Build Status](https://img.shields.io/travis/go-clog/clog/master.svg?style=for-the-badge&logo=travis)](https://travis-ci.org/go-clog/clog) [![codecov](https://img.shields.io/codecov/c/github/go-clog/clog/master?logo=codecov&style=for-the-badge)](https://codecov.io/gh/go-clog/clog) [![GoDoc](https://img.shields.io/badge/GoDoc-Reference-blue?style=for-the-badge&logo=go)](https://godoc.org/unknwon.dev/clog/v2) [![Sourcegraph](https://img.shields.io/badge/view%20on-Sourcegraph-brightgreen.svg?style=for-the-badge&logo=sourcegraph)](https://sourcegraph.com/github.com/go-clog/clog)
+[![Build Status](https://img.shields.io/travis/go-clog/clog/master.svg?style=for-the-badge&logo=travis)](https://travis-ci.org/go-clog/clog) [![codecov](https://img.shields.io/codecov/c/github/go-clog/clog/master?logo=codecov&style=for-the-badge)](https://codecov.io/gh/go-clog/clog) [![GoDoc](https://img.shields.io/badge/GoDoc-Reference-blue?style=for-the-badge&logo=go)](https://pkg.go.dev/unknwon.dev/clog/v2?tab=doc) [![Sourcegraph](https://img.shields.io/badge/view%20on-Sourcegraph-brightgreen.svg?style=for-the-badge&logo=sourcegraph)](https://sourcegraph.com/github.com/go-clog/clog)
 
 ![](https://avatars1.githubusercontent.com/u/25576866?v=3&s=200)