benchmark性能测试的异步测试有问题

[out001a]

https://github.com/coooold/CurlFuture/blob/c938e4d0ad1550b75b682bb1d7523e2cb94a3510/examples/bench.php#L42

http_get2($url)是file_get_contents方式，应该调用http_get3($url)才对。