Install current version of Go
Install current version of Go

This is inspired by the appveyor.yaml from the go-plus project:
https://github.com/joefitzgerald/go-plus/blob/master/appveyor.yml

arithmetric/restic,ar-jan/restic,middelink/restic,howeyc/restic,fawick/restic,episource/restic,restic/restic,bchapuis/restic,fawick/restic,jayme-github/restic,mappu/restic,byo/restic,middelink/restic,ar-jan/restic,kurin/restic,jayme-github/restic,kurin/restic,restic/restic,stuertz/restic,ckemper67/restic,byo/restic,stuertz/restic