Support Ruby 3.0

It does not work with Ruby 3.0.

The following line causes ArgumentError in csv library.
https://github.com/agardiner/csv-diff/blob/e55c1af19e54c626afd023e4767bbd7b289f7412/lib/csv-diff/csv_source.rb#L60

Changing `csv_options` to `**csv_options` will resolve it.