Update .travis.yml

KanDisheng · KanDisheng · commit f2d0f27ecfc4 · 2017-09-07T13:17:30.000+08:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,9 @@
 language: php
+matrix:
+  include:
+    - php: 5.3
+      dist: precise
 php:
-  - 5.3
   - 5.4
   - 5.5
   - 5.6
