Update file .travis.yml

MiniModel · MiniModel · commit ef098e6ad831 · 2018-12-18T00:55:08.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,14 @@
+dist: xenial
+
+addons:
+  apt:
+    packages:
+      - ant-optional
+
 language: php
 
 php:
+  - "7.3"
   - "7.2"
   - "7.1"
   - "7.0"
