README: Adding Travis-CI status to README

README.md

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 ## powerlevel9k Theme for ZSH
 
+[![Build Status](https://travis-ci.org/bhilburn/powerlevel9k.svg?branch=next)](https://travis-ci.org/bhilburn/powerlevel9k)
 [![Join the chat at https://gitter.im/bhilburn/powerlevel9k](https://badges.gitter.im/bhilburn/powerlevel9k.svg)](https://gitter.im/bhilburn/powerlevel9k?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 Powerlevel9k is a theme for ZSH which uses [Powerline