Laravel 5.6 updates

Travis config update

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

vendor/symfony/routing/Loader/AnnotationFileLoader.php

@@ -59,10 +59,9 @@ class AnnotationFileLoader extends FileLoader
             $collection->addResource(new FileResource($path));
             $collection->addCollection($this->loader->load($class, $type));
         }
-        if (\PHP_VERSION_ID >= 70000) {
-            // PHP 7 memory manager will not release after token_get_all(), see https://bugs.php.net/70098
-            gc_mem_caches();
-        }
+
+        // PHP 7 memory manager will not release after token_get_all(), see https://bugs.php.net/70098
+        gc_mem_caches();
 
         return $collection;
     }