try dist: precise

ierusalim · ierusalim · commit 7aa7bb634322 · 2017-08-07T09:41:03.000+03:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,8 @@
 # see http://about.travis-ci.org/docs/user/languages/php/ for more hints
 language: php
 
+dist: precise
+
 sudo: required
 # list any PHP version you want to test against
 php:
