Update composer.json

Author: teamupdivision

composer.json

@@ -5,7 +5,7 @@
     "homepage": "https://github.com/creativetimofficial/black-dashboard-laravel",
     "keywords": ["Laravel", "Preset", "Black"],
     "require": {
-        "laravel/framework": "^5.5"
+        "laravel/framework": "^5.5 || ^6.0"
     },
     "autoload": {
         "psr-4": {