Update file .travis.yml

MiniModel · MiniModel · commit 8227ed6d2479 · 2018-12-17T19:18:45.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,3 +1,10 @@
+dist: xenial
+
+addons:
+  apt:
+    packages:
+      - ant-optional
+
 language: php
 
 php:
