Add Laravel 6 support

Author: dmitry-ivanov

README.md

@@ -2,9 +2,9 @@
 
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-[![Build Status](https://travis-ci.org/dmitry-ivanov/laravel-helper-functions.svg?branch=master)](https://travis-ci.org/dmitry-ivanov/laravel-helper-functions)
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+[![StyleCI](https://styleci.io/repos/61384075/shield?branch=6.x&style=flat)](https://styleci.io/repos/61384075)
+[![Build Status](https://travis-ci.org/dmitry-ivanov/laravel-helper-functions.svg?branch=6.x)](https://travis-ci.org/dmitry-ivanov/laravel-helper-functions)
+[![Coverage Status](https://coveralls.io/repos/github/dmitry-ivanov/laravel-helper-functions/badge.svg?branch=6.x)](https://coveralls.io/github/dmitry-ivanov/laravel-helper-functions?branch=6.x)
 
 [![Latest Stable Version](https://poser.pugx.org/illuminated/helper-functions/v/stable)](https://packagist.org/packages/illuminated/helper-functions)
 [![Latest Unstable Version](https://poser.pugx.org/illuminated/helper-functions/v/unstable)](https://packagist.org/packages/illuminated/helper-functions)
@@ -30,7 +30,7 @@ Laravel-specific and pure PHP helper functions.
 1. Install the package via Composer:
 
     ```shell
-    composer require illuminated/helper-functions
+    composer require "illuminated/helper-functions:^6.0"
     ```
 
 2. Use any of the provided helper functions.