stop testing with Symfony 3.1

Author: craue

.travis.yml

@@ -23,8 +23,6 @@ matrix:
       env: SYMFONY_VERSION='2.7.*' PARAM_DB_DRIVER='pdo_sqlite'
     - php: 5.6
       env: SYMFONY_VERSION='2.8.*'
-    - php: 5.6
-      env: SYMFONY_VERSION='3.1.*'
     - php: 5.6
       env: SYMFONY_VERSION='3.2.*'
     - php: 5.6
@@ -47,6 +45,7 @@ install:
   - composer show
 
 before_script:
+  # create folder for code coverage data
   - mkdir -p build/logs
 
 script: