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/Style/SymfonyStyle/command/command_4_with_iterators.php

@@ -0,0 +1,34 @@
+<?php
+
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Style\SymfonyStyle;
+
+//Ensure has single blank line after any text and a title
+return function (InputInterface $input, OutputInterface $output) {
+    $output = new SymfonyStyle($input, $output);
+
+    $output->write('Lorem ipsum dolor sit amet');
+    $output->title('First title');
+
+    $output->writeln('Lorem ipsum dolor sit amet');
+    $output->title('Second title');
+
+    $output->write('Lorem ipsum dolor sit amet');
+    $output->write('');
+    $output->title('Third title');
+
+    //Ensure edge case by appending empty strings to history:
+    $output->write('Lorem ipsum dolor sit amet');
+    $output->write(new \ArrayIterator(array('', '', '')));
+    $output->title('Fourth title');
+
+    //Ensure have manual control over number of blank lines:
+    $output->writeln('Lorem ipsum dolor sit amet');
+    $output->writeln(new \ArrayIterator(array('', ''))); //Should append an extra blank line
+    $output->title('Fifth title');
+
+    $output->writeln('Lorem ipsum dolor sit amet');
+    $output->newLine(2); //Should append an extra blank line
+    $output->title('Fifth title');
+};