Fix CS

Author: fabpot

MockHttpClient.php

@@ -69,7 +69,7 @@ public function request(string $method, string $url, array $options = []): Respo
         }
 
         if (!$response instanceof ResponseInterface) {
-            throw new TransportException(\sprintf('The response factory passed to MockHttpClient must return/yield an instance of ResponseInterface, "%s" given.', \is_object($response) ? \get_class($response) : \gettype($response)));
+            throw new TransportException(sprintf('The response factory passed to MockHttpClient must return/yield an instance of ResponseInterface, "%s" given.', \is_object($response) ? \get_class($response) : \gettype($response)));
         }
 
         return MockResponse::fromRequest($method, $url, $options, $response);