Cleanup API for discernParser

[mhkeller]

This function has a weird two argument API because it's designed to take either a delimiter or a file path.

It should instead take a single object that takes {fileName: '', delimiter: ''}.

This would be a breaking change for anyone using the discernParser function directly, which is probably zero, but should still be pushed as a major version update.

[mhkeller]

A better API could be

io.discernParser(stringToTest[, {delimiter: true}])

[mhkeller]

Fixed via 0a5469c and published in 3.0.0