use trusty for hhvm build (#44)

Author: dbu

.travis.yml

@@ -2,7 +2,6 @@ language: php
 
 php:
   - 7.1
-  - hhvm
 
 sudo: false
 
@@ -25,6 +24,8 @@ matrix:
       env: SYMFONY_VERSION=3.3.* DEPS=dev
     - php: 7.0
       env: SYMFONY_VERSION=3.1.*
+    - php: hhvm
+      dist: trusty
   fast_finish: true
 
 before_install:

tests/Unit/DependencyInjection/ConfigurationTest.php

@@ -15,7 +15,6 @@
 use Symfony\Cmf\Bundle\ResourceBundle\DependencyInjection\Configuration;
 use Symfony\Component\Config\Definition\Processor;
 use Symfony\Component\Config\FileLocator;
-use Symfony\Component\DependencyInjection\Container;
 use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;