Update README.md

Author: pavelnikolov

README.md

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 # DataLoader
-[![GoDoc](https://godoc.org/gopkg.in/graph-gophers/dataloader.v3?status.svg)](https://godoc.org/github.com/graph-gophers/dataloader)
+[![GoDoc](https://godoc.org/gopkg.in/graph-gophers/dataloader.v7?status.svg)](https://pkg.go.dev/github.com/graph-gophers/dataloader/v7)
 [![Build Status](https://travis-ci.org/graph-gophers/dataloader.svg?branch=master)](https://travis-ci.org/graph-gophers/dataloader)
 
 This is an implementation of [Facebook's DataLoader](https://github.com/facebook/dataloader) in Golang.