Laravel 5.6 updates

Travis config update

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

vendor/symfony/console/Tests/Fixtures/FooWithoutAliasCommand.php

@@ -0,0 +1,21 @@
+<?php
+
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class FooWithoutAliasCommand extends Command
+{
+    protected function configure()
+    {
+        $this
+            ->setName('foo')
+            ->setDescription('The foo command')
+        ;
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $output->writeln('called');
+    }
+}