README: fix links for v2

Signed-off-by: Florian Lehner <[email protected]>

README.md

@@ -1,4 +1,4 @@
-go-nfqueue [![PkgGoDev](https://pkg.go.dev/badge/github.com/florianl/go-nfqueue)](https://pkg.go.dev/github.com/florianl/go-nfqueue) [![Build Status](https://travis-ci.org/florianl/go-nfqueue.svg?branch=master)](https://travis-ci.org/florianl/go-nfqueue) [![Go Report Card](https://goreportcard.com/badge/github.com/florianl/go-nfqueue)](https://goreportcard.com/report/github.com/florianl/go-nfqueue)
+go-nfqueue [![PkgGoDev](https://pkg.go.dev/badge/github.com/florianl/go-nfqueue/v2)](https://pkg.go.dev/github.com/florianl/go-nfqueue/v2) [![Go Report Card](https://goreportcard.com/badge/github.com/florianl/go-nfqueue/v2)](https://goreportcard.com/report/github.com/florianl/go-nfqueue/v2)
 ============
 
 This is `go-nfqueue` and it is written in [golang](https://golang.org/). It provides a [C](https://en.wikipedia.org/wiki/C_(programming_language))-binding free API to the netfilter based queue subsystem of the [Linux kernel](https://www.kernel.org).