Feature request: other output formats

[FelipeLema]

Hey, I'd love to get this tool integrated into my IDE, but I dunno how to deal with the current output format.

Can we get other formats for output? I'm good with JSON or nvim error format (which is something like path:line:column: message )

[mpalmer]

I'd consider a PR for a JSON output, although without a lot of work I doubt we could guarantee output format stability, because at present we just dump the valico errors directly, more-or-less, and I don't know what guarantees they make about error format stability.

[dabrahams]

Without line numbers for the issues, I can't make head or tail of the errors.