docs: add project badges to README

README.md

@@ -2,6 +2,9 @@ go-buffer-pool
 ==================
 
 [![](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)](https://libp2p.io/)
+[![](https://img.shields.io/badge/freenode-%23libp2p-blue.svg?style=flat-square)](https://webchat.freenode.net/?channels=%23libp2p)
+[![codecov](https://codecov.io/gh/libp2p/go-buffer-pool/branch/master/graph/badge.svg)](https://codecov.io/gh/libp2p/go-buffer-pool)
 [![Travis CI](https://travis-ci.org/libp2p/go-buffer-pool.svg?branch=master)](https://travis-ci.org/libp2p/go-buffer-pool)
 
 > A variable size buffer pool for go.