Fix PHP 5.3 CI configuration

maybe?

Author: bsweeney

.travis.yml

@@ -1,7 +1,6 @@
 language: php
 
 php:
-#  - 5.3
   - 5.4
   - 5.5
   - 5.6
@@ -19,3 +18,7 @@ matrix:
   allow_failures:
     - php: hhvm
   fast_finish: true
+  include:
+    -
+      php: "5.3"
+      dist: precise