Update README.md

Author: RyanDaDeng

README.md

@@ -142,7 +142,7 @@ Example Usage
    GoogleReCaptchaV3::verifyResponse($value)->getMessage();
    GoogleReCaptchaV3::verifyResponse($value)->isSuccess();
    GoogleReCaptchaV3::verifyResponse($value)->toArray();
-   GoogleReCaptchaV3::setAction($action)->verifyResponse($value)->isSuccess);
+   GoogleReCaptchaV3::setAction($action)->verifyResponse($value)->isSuccess();
 ```