chore: remove IRC badge from readme (#374)

Author: achingbrain

README.md

@@ -1,7 +1,6 @@
 # @libp2p/kad-dht <!-- omit in toc -->
 
 [![libp2p.io](https://img.shields.io/badge/project-libp2p-yellow.svg?style=flat-square)](http://libp2p.io/)
-[![IRC](https://img.shields.io/badge/freenode-%23libp2p-yellow.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23libp2p)
 [![Discuss](https://img.shields.io/discourse/https/discuss.libp2p.io/posts.svg?style=flat-square)](https://discuss.libp2p.io)
 [![codecov](https://img.shields.io/codecov/c/github/libp2p/js-libp2p-kad-dht.svg?style=flat-square)](https://codecov.io/gh/libp2p/js-libp2p-kad-dht)
 [![CI](https://img.shields.io/github/workflow/status/libp2p/js-libp2p-interfaces/test%20&%20maybe%20release/master?style=flat-square)](https://github.com/libp2p/js-libp2p-kad-dht/actions/workflows/js-test-and-release.yml)