Change Laravel dependency to 5.5 & up

Author: deeshrestha

composer.json

@@ -4,7 +4,7 @@
     "keywords": ["laravel", "preset", "bulma"],
     "license": "MIT",
     "require": {
-        "laravel/framework": "5.5.*"
+        "laravel/framework": "^5.5"
     },
     "autoload": {
         "psr-4": {