Merge pull request #23 from jaykay-design/fix_when

fix "when" detection

src/Routing/Middleware/CacheMiddleware.php

@@ -54,7 +54,7 @@ public function __invoke(Request $request, Response $response, $next) {
 		}
 		/** @var callable $when */
 		$when = $this->getConfig('when');
-		if ($when !== null && $when($request, $request) !== true) {
+		if ($when !== null && $when($request, $response) !== true) {
 			return $next($request, $response);
 		}