#39 go init function 使用分析
https://github.com/talkgo/night/issues/358
init function 的使用，并分析知名开源项目的使用情况。
- 标准包
- TiDB
https://studygolang.com/articles/6464
https://stackoverflow.com/questions/24790175/when-is-the-init-function-run
https://golang.org/doc/effective_go.html#init
https://medium.com/golangspec/init-functions-in-go-eac191b3860a
https://tutorialedge.net/golang/the-go-init-function/
https://github.com/yangwenmai/examples/tree/master/init-example