- update to 0.9.8:
* Fixed error reporting in some cases due to how parsing was handling
nested rules in the grammar - previously the reported location for
the error could be far away from the point where it actually happened.
* Fixed behavior of `default` fn in `dump` and `dumps`. Previously
we didn't require the function to return a string, and so we could
end up returning something that wasn't actually valid. This change
now matches the behavior in the `json` module.