docs: update badges in README

README.md

 go-addr-util
 ==================
 
-[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
-[![](https://img.shields.io/badge/project-libp2p-blue.svg?style=flat-square)](http://github.com/libp2p/libp2p)
-[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
-[![Coverage Status](https://coveralls.io/repos/github/libp2p/go-addr-util/badge.svg?branch=master)](https://coveralls.io/github/libp2p/go-addr-util?branch=master)
+[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://protocol.ai)
+[![](https://img.shields.io/badge/project-libp2p-blue.svg?style=flat-square)](http://libp2p.io/)
+[![](https://img.shields.io/badge/freenode-%23libp2p-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23libp2p)
+[![codecov](https://codecov.io/gh/libp2p/go-addr-util/branch/master/graph/badge.svg)](https://codecov.io/gh/libp2p/go-addr-util)
 [![Travis CI](https://travis-ci.org/libp2p/go-addr-util.svg?branch=master)](https://travis-ci.org/libp2p/go-addr-util)
 
 > Address utilities for libp2p swarm.