chore(docs): update godoc links (#482)

Update godoc links to point to pkg.go.dev
diff --git a/README.markdown b/README.markdown
index 2a637ac..d418cbb 100644
--- a/README.markdown
+++ b/README.markdown
@@ -2,26 +2,26 @@
 ======
 
 [![Build Status](https://travis-ci.org/gomodule/redigo.svg?branch=master)](https://travis-ci.org/gomodule/redigo)
-[![GoDoc](https://godoc.org/github.com/gomodule/redigo/redis?status.svg)](https://godoc.org/github.com/gomodule/redigo/redis)
+[![GoDoc](https://godoc.org/github.com/gomodule/redigo/redis?status.svg)](https://pkg.go.dev/github.com/gomodule/redigo/redis)
 
 Redigo is a [Go](http://golang.org/) client for the [Redis](http://redis.io/) database.
 
 Features
 -------
 
-* A [Print-like](http://godoc.org/github.com/gomodule/redigo/redis#hdr-Executing_Commands) API with support for all Redis commands.
-* [Pipelining](http://godoc.org/github.com/gomodule/redigo/redis#hdr-Pipelining), including pipelined transactions.
-* [Publish/Subscribe](http://godoc.org/github.com/gomodule/redigo/redis#hdr-Publish_and_Subscribe).
-* [Connection pooling](http://godoc.org/github.com/gomodule/redigo/redis#Pool).
-* [Script helper type](http://godoc.org/github.com/gomodule/redigo/redis#Script) with optimistic use of EVALSHA.
-* [Helper functions](http://godoc.org/github.com/gomodule/redigo/redis#hdr-Reply_Helpers) for working with command replies.
+* A [Print-like](https://pkg.go.dev/github.com/gomodule/redigo/redis#hdr-Executing_Commands) API with support for all Redis commands.
+* [Pipelining](https://pkg.go.dev/github.com/gomodule/redigo/redis#hdr-Pipelining), including pipelined transactions.
+* [Publish/Subscribe](https://pkg.go.dev/github.com/gomodule/redigo/redis#hdr-Publish_and_Subscribe).
+* [Connection pooling](https://pkg.go.dev/github.com/gomodule/redigo/redis#Pool).
+* [Script helper type](https://pkg.go.dev/github.com/gomodule/redigo/redis#Script) with optimistic use of EVALSHA.
+* [Helper functions](https://pkg.go.dev/github.com/gomodule/redigo/redis#hdr-Reply_Helpers) for working with command replies.
 
 Documentation
 -------------
 
-- [API Reference](http://godoc.org/github.com/gomodule/redigo/redis)
+- [API Reference](https://pkg.go.dev/github.com/gomodule/redigo/redis)
 - [FAQ](https://github.com/gomodule/redigo/wiki/FAQ)
-- [Examples](https://godoc.org/github.com/gomodule/redigo/redis#pkg-examples)
+- [Examples](https://pkg.go.dev/github.com/gomodule/redigo/redis#pkg-examples)
 
 Installation
 ------------
@@ -35,7 +35,7 @@
 Related Projects
 ----------------
 
-- [rafaeljusto/redigomock](https://godoc.org/github.com/rafaeljusto/redigomock) - A mock library for Redigo.
+- [rafaeljusto/redigomock](https://pkg.go.dev/github.com/rafaeljusto/redigomock) - A mock library for Redigo.
 - [chasex/redis-go-cluster](https://github.com/chasex/redis-go-cluster) - A Redis cluster client implementation.
 - [FZambia/sentinel](https://github.com/FZambia/sentinel) - Redis Sentinel support for Redigo
 - [mna/redisc](https://github.com/mna/redisc) - Redis Cluster client built on top of Redigo