Temporarily remove PHP 5.2 from travis config
diff --git a/.travis.yml b/.travis.yml
index 2584e8a..29111bc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,6 @@
 language: php
 
 php:
-  - 5.2
   - 5.3
   - 5.4