Laravel 5.6 updates

Travis config update

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

vendor/symfony/console/CHANGELOG.md

@@ -1,6 +1,23 @@
 CHANGELOG
 =========
 
+4.1.0
+-----
+
+ * added option to run suggested command if command is not found and only 1 alternative is available
+ * added option to modify console output and print multiple modifiable sections
+ * added support for iterable messages in output `write` and `writeln` methods
+
+4.0.0
+-----
+
+ * `OutputFormatter` throws an exception when unknown options are used
+ * removed `QuestionHelper::setInputStream()/getInputStream()`
+ * removed `Application::getTerminalWidth()/getTerminalHeight()` and 
+  `Application::setTerminalDimensions()/getTerminalDimensions()`
+* removed `ConsoleExceptionEvent`
+* removed `ConsoleEvents::EXCEPTION`
+
 3.4.0
 -----