Golang installation

There are several ways how to install golang:

1. https://github.com/golang/go/wiki/Ubuntu
   1. sudo apt-get install golang-go
   2. on Ubuntu 16.04 you may need to add repo:

      sudo add-apt-repository ppa:longsleep/golang-backports
      sudo apt-get update
      sudo apt-get install golang-go

2. https://golang.org/doc/install