Make travis test on multiple php versions
diff --git a/.travis.yml b/.travis.yml
index 032bf9d..2584e8a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: php
 
-phps:
+php:
   - 5.2
   - 5.3
   - 5.4