wget 的限速和代理

使用代理：
$ wget -e http_proxy=10.250.64.101:3128 -e https_proxy=10.250.64.101:3128 https://github.com/docker/compose/releases/download/1.25.0/docker-compose-$(uname -s)-$(uname -m)

限速：

$ wget http://10.250.17.133:84/gsts.tar.gz -O gsts.tar.gz --limit-rate=30k