Readme: Fix coverage badge

README.md

@@ -3,7 +3,7 @@
 [![LICENSE](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
 [![Join the chat at https://gitter.im/Geal/nom](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/Geal/nom?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 [![Build Status](https://github.com/Geal/nom/actions/workflows/ci.yml/badge.svg)](https://github.com/Geal/nom/actions/workflows/ci.yml)
-[![Coverage Status](https://coveralls.io/repos/Geal/nom/badge.svg?branch=master)](https://coveralls.io/r/Geal/nom?branch=master)
+[![Coverage Status](https://coveralls.io/repos/github/Geal/nom/badge.svg?branch=master)](https://coveralls.io/github/Geal/nom?branch=master)
 [![Crates.io Version](https://img.shields.io/crates/v/nom.svg)](https://crates.io/crates/nom)
 [![Minimum rustc version](https://img.shields.io/badge/rustc-1.48.0+-lightgray.svg)](#rust-version-requirements)