Merge pull request gruntjs#1295 from XhmikosR/readme

Update README.md.

Author: sindresorhus

README.md

@@ -1,6 +1,6 @@
 # Grunt: The JavaScript Task Runner
 
-[![Build Status: Linux](https://travis-ci.org/gruntjs/grunt-contrib-clean.svg?branch=master)](https://travis-ci.org/gruntjs/grunt-contrib-clean)
+[![Build Status: Linux](https://travis-ci.org/gruntjs/grunt.svg?branch=master)](https://travis-ci.org/gruntjs/grunt)
 [![Build Status: Windows](https://ci.appveyor.com/api/projects/status/32r7s2skrgm9ubva/branch/master?svg=true)](https://ci.appveyor.com/project/gruntjs/grunt/branch/master)
 [![Built with Grunt](https://cdn.gruntjs.com/builtwith.png)](http://gruntjs.com/)