updated travis

.travis.yml

@@ -1,7 +1,6 @@
 language: bash
+dist: trusty
 sudo: required
-env:
-- DISTRO=ubuntu-trusty
 
 before_script:
     - curl -L "https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/shunit2/shunit2-2.1.6.tgz" | tar zx