scanproxy is auto scan IP & port,and check that is proxy if port is open...(scanproxy是一个自动扫描端口，并且检测是否是代理服务器的程序)
-a country codes, see ISO 3166-1 (default "CN")
-f scan mode, fast is only scan common port, default is scan all port
-i set scan how many IP segment in same times, it will affect memory footprint (default 10)
-m maximum concurrency number (default 200)
### e.g.
scanproxy_linux_amd64 -a JP -f -m 1000 -i 20