Updated the php 5.3 comment

Author: GrahamCampbell

.travis.yml

@@ -7,7 +7,7 @@ php:
 
   # aliased to 5.2.17
   - 5.2
-  # aliased to a recent 5.3.x version
+  # aliased to 5.3.29
   - 5.3
   # aliased to a recent 5.4.x version
   - 5.4