fix the travis build for PHP-5.6 using precise instead of trusty

diff --git a/.travis.yml b/.travis.yml
index c78b4b7d062bb7ee26d8f1920255a8a3e0a36a73..8e39fb4f2c6d5c9346962cf4c0fb19b9dcb14f1e 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,4 @@
-dist: trusty
+dist: precise
 language: c
 sudo: false
 addons: