Laravel 5.6 updates

Travis config update

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

vendor/symfony/console/Command/Command.php

@@ -66,7 +66,7 @@ class Command
      *
      * @throws LogicException When the command name is empty
      */
-    public function __construct($name = null)
+    public function __construct(string $name = null)
     {
         $this->definition = new InputDefinition();
 
@@ -273,15 +273,7 @@ class Command
         if ($code instanceof \Closure) {
             $r = new \ReflectionFunction($code);
             if (null === $r->getClosureThis()) {
-                if (\PHP_VERSION_ID < 70000) {
-                    // Bug in PHP5: https://bugs.php.net/bug.php?id=64761
-                    // This means that we cannot bind static closures and therefore we must
-                    // ignore any errors here.  There is no way to test if the closure is
-                    // bindable.
-                    $code = @\Closure::bind($code, $this);
-                } else {
-                    $code = \Closure::bind($code, $this);
-                }
+                $code = \Closure::bind($code, $this);
             }
         }
 
@@ -643,11 +635,9 @@ class Command
      *
      * It must be non-empty and parts can optionally be separated by ":".
      *
-     * @param string $name
-     *
      * @throws InvalidArgumentException When the name is invalid
      */
-    private function validateName($name)
+    private function validateName(string $name)
     {
         if (!preg_match('/^[^\:]++(\:[^\:]++)*$/', $name)) {
             throw new InvalidArgumentException(sprintf('Command name "%s" is invalid.', $name));