enable Ubuntu 14.04 beta in travis

Pavlos Ratis · Pavlos Ratis · commit 292511c89110 · 2015-11-11T11:52:42.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,3 +1,5 @@
+sudo: required
+dist: trusty
 language: php
 php:
   - 5.5
