README: replace riot.im badge with IRC.

README.md

@@ -1,7 +1,7 @@
 Basic logging with batteries
 ----------------------------
 
-[![talk on matrix](https://github.com/prataprc/dotfiles/blob/master/assets/talkonmatrix.svg)](https://riot.im/app/#/user/@prataprc:matrix.org?action=chat)
+[![IRC #go-nuts](https://www.irccloud.com/invite-svg?channel=%23go-nuts&hostname=chat.freenode.net&port=6697&ssl=1)](https://www.irccloud.com/invite?channel=%23go-nuts&hostname=chat.freenode.net&port=6697&ssl=1)
 [![Build Status](https://travis-ci.org/bnclabs/golog.png)](https://travis-ci.org/bnclabs/golog)
 [![Coverage Status](https://coveralls.io/repos/github/bnclabs/golog/badge.svg?branch=master)](https://coveralls.io/github/bnclabs/golog?branch=master)
 [![GoDoc](https://godoc.org/github.com/bnclabs/golog?status.png)](https://godoc.org/github.com/bnclabs/golog)