support flag for folks who use that kind of thing

[mcncl]

Changes

Some of our older users 😛 will be used to --version or -v for printing the version, so let's support that.

[sj26]

Nice!

https://www.gnu.org/prep/standards/html_node/Command_002dLine-Interfaces.html

All programs should support two standard options: ‘--version’ and ‘--help’.

[sj26]

Note that -V (upper case) is typically for "version", and -v (lower case) is typically --verbose.