doc: add libp2p badges to top of README

README.md

 # go-msgio - Message IO
 
+[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](https://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-libp2p-netutil/branch/master/graph/badge.svg)](https://codecov.io/gh/libp2p/go-msgio)
+[![Travis CI](https://travis-ci.org/libp2p/go-libp2p-netutil.svg?branch=master)](https://travis-ci.org/libp2p/go-msgio)
+
 This is a simple package that helps read and write length-delimited slices. It's helpful for building wire protocols.
 
 ## Usage