This is how I think go versioning could work...

idea.go

package main

import (
  // mypackage "github.com/danott/mypackage" 
	mypackage "some-clever-service-name-for-versioning-go-programs.com/danott/mypackage/0.0.1"
)

func main() {
	mypackage.ExportedFun()
}