Add Laravel v6.0 support

readme.md

@@ -7,7 +7,7 @@
 This package comes with the much desired xml support for you Laravel project including middleware to accept only xml requests, 
 http response in xml, and more utilities for xml conversions as well as validation.
 
-**Supports:** Laravel versions 5.3, 5.4, 5.5, 5.6, 5.7, 5.8
+**Supports:** Laravel versions 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 6.0
 
 ### Installation
 
@@ -194,4 +194,4 @@ If you've stumbled across a bug, please help us by leaving as much information a
 - Actual result
 
 This will help us to fix the bug as quickly as possible, and if you do wish to fix it yourself; 
-feel free to [fork the package on GitHub](https://github.com/mtvbrianking/laravel-xml) and submit a pull request!
+feel free to [fork the package on GitHub](https://github.com/mtvbrianking/laravel-xml) and submit a pull request!