report column numbers

[kbirger]

I am thinking of writing a VS Code extension on top of this package. It would be helpful to have at least a column, but ideally a start and end column reported by the linter. This would allow for precise underlines in VS Code.

In fact, it seems like this might be trivial as rules have access to this information:
https://github.com/vsiakka/gherkin-lint/blob/master/src/rules/indentation.js#L47

Unfortunately, I guess it would be a breaking change.

edit: If this gets support/approval, I would be happy to do the work and submit a PR