use new container infrastructure on Travis

splitbrain · splitbrain · commit ae725da53659 · 2015-07-24T15:24:00.000+02:00
See http://docs.travis-ci.com/user/migrating-from-legacy
diff --git a/.travis.yml b/.travis.yml
@@ -1,4 +1,5 @@
 language: php
+sudo: false
 php:
   - "5.6"
   - "5.5"
