[tz] tzdata2016g missing version information

[Steve Summit]

Paul wrote:
> On 09/28/2016 12:35 PM, Alexander Belopolsky wrote:
> > I would also ask for [the version] file to be installable in the
> > zoneinfo directory...
>
> It should be installable, for those who want to install it there. There 
> is a bit of fun if someone runs the shell command 'TZ="version" date'; 

Maybe install it in the zoneinfo dir as ".version"?