Fix link in Travis build status button

Author: ptlis

README.md

@@ -5,7 +5,7 @@ A parser for unified diff files, returning a hydrated object graph.
 Uses __toString() to serialize back into unified diff format.
 
 
-[![Build Status](https://api.travis-ci.com/ptlis/diff-parser.svg?branch=master&status=passed)](https://travis-ci.com/ptlis/diff-parser) [![Code Coverage](https://scrutinizer-ci.com/g/ptlis/diff-parser/badges/coverage.png?s=6c30a32e78672ae0d7cff3ecf00ceba95049879a)](https://scrutinizer-ci.com/g/ptlis/diff-parser/) [![Scrutinizer Quality Score](https://scrutinizer-ci.com/g/ptlis/diff-parser/badges/quality-score.png?s=b8a262b33dd4a5de02d6f92f3e318ebb319f96c0)](https://scrutinizer-ci.com/g/ptlis/diff-parser/) [![Latest Stable Version](https://poser.pugx.org/ptlis/diff-parser/v/stable.png)](https://packagist.org/packages/ptlis/diff-parser)
+[![Build Status](https://api.travis-ci.com/ptlis/diff-parser.svg?branch=master&status=passed)](https://app.travis-ci.com/github/ptlis/diff-parser) [![Code Coverage](https://scrutinizer-ci.com/g/ptlis/diff-parser/badges/coverage.png?s=6c30a32e78672ae0d7cff3ecf00ceba95049879a)](https://scrutinizer-ci.com/g/ptlis/diff-parser/) [![Scrutinizer Quality Score](https://scrutinizer-ci.com/g/ptlis/diff-parser/badges/quality-score.png?s=b8a262b33dd4a5de02d6f92f3e318ebb319f96c0)](https://scrutinizer-ci.com/g/ptlis/diff-parser/) [![Latest Stable Version](https://poser.pugx.org/ptlis/diff-parser/v/stable.png)](https://packagist.org/packages/ptlis/diff-parser)