updated to current laravel version

Author: Tobias Weichart

composer.json

@@ -13,12 +13,12 @@
     ],
     "require": {
         "php": ">=7.0.0",
-        "laravel/framework": "5.5.*",
+        "laravel/framework": "~5.6",
         "encore/laravel-admin": "1.5.*"
     },
     "require-dev": {
         "phpunit/phpunit": "~6.0",
-        "laravel/laravel": "5.5.*"
+        "laravel/laravel": "~5.6"
     },
     "autoload": {
         "psr-4": {