https://github.com/golang/go/wiki/Modules

2019
https://medium.com/@adiach3nko/package-management-with-go-modules-the-pragmatic-guide-c831b4eaaf31
    https://habr.com/ru/company/otus/blog/503918/
https://blog.golang.org/using-go-modules
2018
Intro to Go Modules and SemVer
    https://www.youtube.com/watch?v=aeF3l-zmPsY