Use Xenial

Author: nanasess

.travis.yml

@@ -1,9 +1,10 @@
 language: php
 
+addons:
+  apt:
+    packages:
+      - libxml2-utils
 php:
-  - 5.3
-  - 5.4
-  - 5.5
   - 5.6
   - "7.0"
   - "7.1"
@@ -13,6 +14,29 @@ env:
     - DEPENDENCIES="high"
     - DEPENDENCIES="low"
 
+matrix:
+   fast_finish: true
+   include:
+     - php: 5.3
+       dist: precise
+       env: DEPENDENCIES="high"
+     - php: 5.3
+       dist: precise
+       env: DEPENDENCIES="low"
+     - php: 5.4
+       dist: trusty
+       env: DEPENDENCIES="high"
+     - php: 5.4
+       dist: trusty
+       env: DEPENDENCIES="low"
+     - php: 5.5
+       dist: trusty
+       env: DEPENDENCIES="high"
+     - php: 5.5
+       dist: trusty
+       env: DEPENDENCIES="low"
+
+dist: xenial
 sudo: false
 
 before_install: