docs(readme): Remove unused badge

README.md

@@ -3,8 +3,6 @@
 
 [![Build Status](https://img.shields.io/travis/karma-runner/karma/master.svg?style=flat-square)](https://travis-ci.org/karma-runner/karma) [![Code Climate](https://img.shields.io/codeclimate/github/karma-runner/karma.svg?style=flat-square)](https://codeclimate.com/github/karma-runner/karma) [![PRs Welcome](https://img.shields.io/badge/prs-welcome-brightgreen.svg?style=flat-square)](http://makeapullrequest.com) [![Dependency Status](https://img.shields.io/david/karma-runner/karma.svg?style=flat-square)](https://david-dm.org/karma-runner/karma) [![devDependency Status](https://img.shields.io/david/dev/karma-runner/karma.svg?style=flat-square)](https://david-dm.org/karma-runner/karma#info=devDependencies)
 
-[![Sauce Test Status](https://saucelabs.com/browser-matrix/karmarunnerbot.svg)](https://saucelabs.com/u/karmarunnerbot)
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 A simple tool that allows you to execute JavaScript code in multiple
 _real_ browsers.