feat: update php version

sabakugaara · sabakugaara · commit ae510b36cbc5 · 2016-12-14T10:26:03.000+08:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,6 @@
 language: php
 php:
-  - "5.3"
+  - "5.5"
 before_script:
   - composer install
 script:
