Fix Laravel version constraints

Author: pelmered

composer.json

@@ -13,15 +13,7 @@
     "require": {
         "php": ">=7.0",
         "alymosul/exponent-server-sdk-php": "1.1.*",
-        "illuminate/config": "5.4.* || 5.5.* || 5.6.* || 5.7.* || 5.8.* || 6.0.*",
-        "illuminate/notifications": "5.4.* || 5.5.* || 5.6.* || 5.7.* || 5.8.* || 6.0.*",
-        "illuminate/support": "5.4.* || 5.5.* || 5.6.* || 5.7.* || 5.8.* || 6.0.*",
-        "illuminate/events": "5.4.* || 5.5.* || 5.6.* || 5.7.* || 5.8.* || 6.0.*",
-        "illuminate/queue": "5.4.* || 5.5.* || 5.6.* || 5.7.* || 5.8.* || 6.0.*",
-        "illuminate/http": "5.4.* || 5.5.* || 5.6.* || 5.7.* || 5.8.* || 6.0.*",
-        "illuminate/routing": "5.4.* || 5.5.* || 5.6.* || 5.7.* || 5.8.* || 6.0.*",
-        "illuminate/validation": "5.4.* || 5.5.* || 5.6.* || 5.7.* || 5.8.* || 6.0.*",
-        "illuminate/auth": "5.4.* || 5.5.* || 5.6.* || 5.7.* || 5.8.* || 6.0.*"
+        "laravel/framework": "^5.6 || ^6.0",
     },
     "require-dev": {
         "mockery/mockery": "^0.9.5",