Update composer.json

Author: ThomasEnssner

Diff for: composer.json

@@ -23,7 +23,7 @@
     "require": {
         "php": ">=7.1",
         "appstract/laravel-blade-directives": "^1.1",
-        "laravel/framework": "~5.5|~6.0"
+        "laravel/framework": "~6.0|~7.0"
     },
     "config": {
         "sort-packages": true