Inconsistent version flag in CommandApp vs CommandIOApp

[alexcardell]

This is a tiny issue, but the CommandIOApp version flag has a short flag and the CommandApp does not.

Personally, I'd prefer a short flag for verbosity over version, so it'd be good to make it configurable with a non-breaking default to avoid any breaking changes in people's scripts.

[bkirwi]

Nice catch! I agree that we really shouldn't be adding a short flag by default there... it's nonstandard and conflicts with other common usages.

I'll need to be careful about backwards compatability here, so this might need to wait for a larger release. I'll have a look. (But in any case will merge it sooner or later - thank you for the PR!)

If this is blocking you (or annoying any other reader) in the meantime, note that it's possible to add your own version flag to the command you pass in, as in myCommand orElse Opts.flag("version", ...).map(printVersion) or whatever.