upgrade to laravel 6.x

app/Http/Controllers/DownloadController.php

@@ -57,7 +57,7 @@ class DownloadController extends Controller
         # From the headers we need to remove the first Element since it's the status code:
         $status = $headers[0];
         $status = intval(preg_split("/\s+/si", $status)[1]);
-        array_forget($headers, 0);
+        Arr::forget($headers, 0);
 
         # Add the Filename if it's not set:
         if (!isset($headers["Content-Disposition"])) {

composer.json

@@ -8,18 +8,17 @@
     ],
     "license": "MIT",
     "require": {
-        "php": "^7.1.3",
-        "fideloper/proxy": "^4.0",
-        "laravel/framework": "5.8.*",
-        "laravel/tinker": "^1.0"
+        "php": "^7.2.5|^8.0",
+        "fideloper/proxy": "^4.4",
+        "laravel/framework": "^6.20.26",
+        "laravel/tinker": "^2.5"
     },
     "require-dev": {
-        "beyondcode/laravel-dump-server": "^1.0",
-        "filp/whoops": "^2.0",
-        "fzaninotto/faker": "^1.4",
+        "facade/ignition": "^1.16.15",
+        "fakerphp/faker": "^1.9.1",
         "mockery/mockery": "^1.0",
         "nunomaduro/collision": "^3.0",
-        "phpunit/phpunit": "^7.5"
+        "phpunit/phpunit": "^8.5.8|^9.3.3"
     },
     "config": {
         "optimize-autoloader": true,