Added badge to README.

Author: neogeek

README.md

@@ -2,6 +2,7 @@
 
 > GitHub wiki export plugin for doxdox.
 
+[![Build Status](https://travis-ci.org/neogeek/doxdox-plugin-github-wiki.svg?branch=master)](https://travis-ci.org/neogeek/doxdox-plugin-github-wiki)
 [![NPM Version](http://img.shields.io/npm/v/doxdox-plugin-github-wiki.svg?style=flat)](https://www.npmjs.org/package/doxdox-plugin-github-wiki)
 
 ## Install