Re: pre-release test: GNU Datamash 1.7.74-c040

[Tim Rice]

Hey Erik,

> Not really a problem, but I wonder if the copyright year should be updated
> to 2022?

Ah yeah, sure thing.

I tweaked the rest of the copyright/author notice from `--version` too. 
Hopefully it's now consistent with [1].

[1] https://www.gnu.org/prep/maintain/maintain.html#Copyright-Notices

I could support an argument that copyright should be inferred from Git history 
as the source of truth, and save --version for concise version information, but 
such a pattern doesn't seem to be favored by the broader GNUniverse :)

~ Tim