Test with symfony 3.2 and not 3.0 (#16)

Author: Nyholm

.travis.yml

@@ -18,8 +18,8 @@ env:
   global:
     - TEST_COMMAND="composer test"
   matrix:
+    - SYMFONY_VERSION=3.2.*
     - SYMFONY_VERSION=3.1.*
-    - SYMFONY_VERSION=3.0.*
     - SYMFONY_VERSION=2.8.*
     - SYMFONY_VERSION=2.7.*