update readme for version 3.1.0

Author: michaeldyrynda

README.md

@@ -1,5 +1,5 @@
 # Laravel Model UUIDs
-## v3.0.0
+## v3.1.0
 
 [![Build Status](https://travis-ci.org/michaeldyrynda/laravel-model-uuid.svg?branch=master)](https://travis-ci.org/michaeldyrynda/laravel-model-uuid)
 [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/michaeldyrynda/laravel-model-uuid/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/michaeldyrynda/laravel-model-uuid/?branch=master)
@@ -21,6 +21,8 @@ Take a look at [laravel-efficient-uuid](https://github.com/michaeldyrynda/larave
 
 This package supports Laravel 5.5 as of version 3.0.0.
 
+This package supports Laravel 5.6 as of version 3.1.0.
+
 ## Code Samples
 
 In order to use this package, you simply need to import and use the trait within your Eloquent models.