use 5.3 instead of 5.3.3 for lower testing

Author: lsmith77

.travis.yml

@@ -23,7 +23,7 @@ matrix:
       env: SYMFONY_VERSION=2.3.* PACKAGE_VERSION=high
     - php: 5.6
       env: SYMFONY_VERSION=2.5.* PACKAGE_VERSION=high
-    - php: 5.3.3
+    - php: 5.3
       env: SYMFONY_VERSION=2.3.* PACKAGE_VERSION=low
   allow_failures:
     - php: 5.6