Laravel 5.6 updates

Travis config update

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

vendor/symfony/routing/Tests/Fixtures/localized/importer-with-locale.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<routes xmlns="http://symfony.com/schema/routing"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://symfony.com/schema/routing
+        http://symfony.com/schema/routing/routing-1.0.xsd">
+    <import resource="./imported-with-locale.xml">
+        <prefix locale="fr">/le-prefix</prefix>
+        <prefix locale="en">/the-prefix</prefix>
+    </import>
+</routes>