Laravel 5.6 updates

Travis config update

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

vendor/phpunit/php-timer/ChangeLog.md

@@ -0,0 +1,15 @@
+# ChangeLog
+
+All notable changes are documented in this file using the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
+
+## [2.0.0] - 2018-02-01
+
+### Changed
+
+* This component now uses namespaces
+
+### Removed
+
+* This component is no longer supported on PHP 5.3, PHP 5.4, PHP 5.5, PHP 5.6, and PHP 7.0
+
+[2.0.0]: https://github.com/sebastianbergmann/diff/compare/1.0.9...2.0.0