Added 4.0 version to README

Author: norberttech

README.md

@@ -12,7 +12,8 @@ PHPMatcher::error() : ?string;
 
 It was built to simplify API's functional testing.
 
-* [![Build Status](https://travis-ci.org/coduo/php-matcher.svg)](https://travis-ci.org/coduo/php-matcher) - [4.0 (master) README](https://github.com/coduo/php-matcher/tree/master/README.md)  PHP >= 7.2
+* [![Build Status](https://travis-ci.org/coduo/php-matcher.svg)](https://travis-ci.org/coduo/php-matcher) - [5.0 (master) README](https://github.com/coduo/php-matcher/tree/master/README.md)  PHP >= 7.2
+* [![Build Status](https://travis-ci.org/coduo/php-matcher.svg?branch=4.0)](https://travis-ci.org/coduo/php-matcher) - [4.0 (master) README](https://github.com/coduo/php-matcher/tree/4.0/README.md)  PHP >= 7.2
 * [![Build Status](https://travis-ci.org/coduo/php-matcher.svg?branch=3.2)](https://travis-ci.org/coduo/php-matcher) - [3.2.* README](https://github.com/coduo/php-matcher/tree/3.2/README.md) PHP >= 7.0 
 * [![Build Status](https://travis-ci.org/coduo/php-matcher.svg?branch=3.1)](https://travis-ci.org/coduo/php-matcher) - [3.1.* README](https://github.com/coduo/php-matcher/tree/3.1/README.md) PHP >= 7.0