Updated integration test version

Author: Nyholm

composer.json

@@ -34,7 +34,7 @@
     },
     "require-dev": {
         "phpunit/phpunit":         "^4.0 || ^5.1",
-        "cache/integration-tests": "^0.11",
+        "cache/integration-tests": "^0.12",
         "cache/array-adapter":     "^0.4"
     },
     "autoload":    {