switch travis to ubuntu trusty

MagicalTux · MagicalTux · commit 6eff248bfcf8 · 2016-08-20T06:35:02.000+09:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,4 +1,5 @@
 sudo: required
+dist: trusty
 language: php
 php:
   - 7.0
