Merge pull request #4 from stayallive/feature/laravel56

Add Laravel 5.6 compat

Author: sebdesign

composer.json

@@ -8,7 +8,7 @@
     "homepage": "https://github.com/sebdesign/laravel-sri",
     "type": "library",
     "require": {
-        "laravel/framework": "~5.1.16|~5.2.0|~5.3.0|~5.4.0|~5.5.0"
+        "laravel/framework": "~5.1.16|~5.2.0|~5.3.0|~5.4.0|~5.5.0|~5.6.0"
     },
     "require-dev": {
         "phpunit/phpunit": "~4.0|~5.0|~6.0",