Update README.md

README.md

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 # CakePHP Tools Plugin
-[![Build Status](https://api.travis-ci.org/dereuromark/cakephp-tools.svg)](https://travis-ci.org/dereuromark/cakephp-tools)
+[![Build Status](https://api.travis-ci.org/dereuromark/cakephp-tools.svg?branch=master)](https://travis-ci.org/dereuromark/cakephp-tools)
 [![Coverage Status](https://img.shields.io/codecov/c/github/dereuromark/cakephp-tools/master.svg)](https://codecov.io/github/dereuromark/cakephp-tools?branch=master)
 [![Minimum PHP Version](http://img.shields.io/badge/php-%3E%3D%205.4-8892BF.svg)](https://php.net/)
 [![License](https://poser.pugx.org/dereuromark/cakephp-tools/license.svg)](https://packagist.org/packages/dereuromark/cakephp-tools)