Updating to latest integration tests

Author: Nyholm

composer.json

@@ -35,7 +35,7 @@
     },
     "require-dev": {
         "phpunit/phpunit":         "^4.0 || ^5.1",
-        "cache/integration-tests": "^0.12",
+        "cache/integration-tests": "^0.13",
         "cache/array-adapter":     "^0.4"
     },
     "autoload":    {