Composer update

* updated Laravel to v5.6.38
* Added laravel tinker in dev dependencies

vendor/filp/whoops/CHANGELOG.md

@@ -1,3 +1,7 @@
+# 2.2.0
+
+* Support PHP 7.2
+
 # 2.1.0
 
 * Add a `SystemFacade` to allow clients to override Whoops behavior.

vendor/filp/whoops/composer.json

@@ -36,7 +36,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "2.1-dev"
+            "dev-master": "2.2-dev"
         }
     }
 }

vendor/filp/whoops/src/Whoops/Handler/PrettyPageHandler.php

@@ -507,6 +507,10 @@ class PrettyPageHandler extends Handler
                 $callback = call_user_func($this->editors[$this->editor], $filePath, $line);
             }
 
+            if (empty($callback)) {
+                return [];
+            }
+
             if (is_string($callback)) {
                 return [
                     'ajax' => false,