guotao

Step 1: set git through socks5 proxy:
```git config --global http.proxy socks5://127.0.0.1:1080```
Step 2: go get via socks5 proxy:
```http_proxy=socks5://127.0.0.1:1080 go get github.com/mattn/go-sqlite3```
Recover git global config:
```git config --global --unset http.proxy```