Update README.md

Author: dim-s

README.md

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 JPHP - an implementation of PHP
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-[![Build Status](https://travis-ci.org/jphp-compiler/jphp.svg?branch=master)](https://travis-ci.org/jphp-compiler/jphp)
+[![Build Status](https://travis-ci.org/jphp-group/jphp.svg?branch=master)](https://travis-ci.org/jphp-group/jphp)
 
 JPHP is a new implementation for PHP which uses the Java VM. It supports many features of the PHP language (7.1+).