Laravel 5.6 updates

Travis config update

Removed HHVM script as Laravel no longer support HHVM after releasing 5.3

vendor/symfony/var-dumper/Caster/Caster.php

@@ -48,11 +48,6 @@ class Caster
      */
     public static function castObject($obj, $class, $hasDebugInfo = false)
     {
-        if ($class instanceof \ReflectionClass) {
-            @trigger_error(sprintf('Passing a ReflectionClass to "%s()" is deprecated since Symfony 3.3 and will be unsupported in 4.0. Pass the class name as string instead.', __METHOD__), E_USER_DEPRECATED);
-            $hasDebugInfo = $class->hasMethod('__debugInfo');
-            $class = $class->name;
-        }
         if ($hasDebugInfo) {
             $a = $obj->__debugInfo();
         } elseif ($obj instanceof \Closure) {