readme IRC badge improvement

the server is now in the badge label and the channel is shown on hover

README.md

@@ -1,5 +1,5 @@
 # Crafatar [![travis](https://img.shields.io/travis/crafatar/crafatar/master.svg?style=flat-square)](https://travis-ci.org/crafatar/crafatar/) [![Coverage Status](https://img.shields.io/coveralls/crafatar/crafatar.svg?style=flat-square)](https://coveralls.io/r/crafatar/crafatar) [![Code Climate](https://img.shields.io/codeclimate/github/crafatar/crafatar.svg?style=flat-square)](https://codeclimate.com/github/crafatar/crafatar)
-[![IRC: #crafatar](https://img.shields.io/badge/IRC-%23crafatar-blue.svg?style=flat-square)](https://webchat.esper.net/?channels=crafatar) [![dependency status](https://img.shields.io/david/crafatar/crafatar.svg?style=flat-square)](https://david-dm.org/crafatar/crafatar) [![devDependency status](https://img.shields.io/david/dev/crafatar/crafatar.svg?style=flat-square)](https://david-dm.org/crafatar/crafatar#info=devDependencies) [![docs status](https://inch-ci.org/github/crafatar/crafatar.svg?branch=master&style=flat-square)](https://inch-ci.org/github/crafatar/crafatar)
+[![IRC: esper.net](https://img.shields.io/badge/IRC-esper.net-blue.svg?style=flat-square)](https://webchat.esper.net/?channels=crafatar "#crafatar") [![dependency status](https://img.shields.io/david/crafatar/crafatar.svg?style=flat-square)](https://david-dm.org/crafatar/crafatar) [![devDependency status](https://img.shields.io/david/dev/crafatar/crafatar.svg?style=flat-square)](https://david-dm.org/crafatar/crafatar#info=devDependencies) [![docs status](https://inch-ci.org/github/crafatar/crafatar.svg?branch=master&style=flat-square)](https://inch-ci.org/github/crafatar/crafatar)
 
 
 <img alt="logo" src="lib/public/logo.png" align="right">