Error messages: Include argument that caused error

[steventilator]

When an invalid interval is passed to functions that require an Interval (like eachMonthOfInterval()), the following error is thrown:

RangeError: Invalid interval

Would it be possible to include the faulty interval in the error message? This would help a lot while debugging.

I'm not sure whether other functions of date-fns include the faulty arguments in the error messages, but if they don't we might want to think about including them there as well.