v0.1.9

Release v0.1.9

**New `CSVNormalizer.from` method**: This method is intended to be the inverse
of the `.toObject` method. It is useful to have such a method as a functional
(i.e., non-mutating) alternative to `.toFieldMap`. This way you can avoid
having to manually rewrite the CSV row when you want to pass it back into the
stream.

**New `.source` property for `.toFieldMap`**: The `Proxy` object returned by
`CSVNormalizer.toFieldMap` now has a new `.source` property which simply
returns the original row object that was passed into `.toFieldMap`. This
property is useful when the original row object was passed in as an object
literal and there is no other variable referencing it.

**Fixed `TransformationFunction` output type**: The JSDoc type definition for
`TransformationFunction` now recognizes
`Promise<ReadableStream<TransformationOutput>>` as a valid return type. This
return type is seen when working with `fetch` requests, either by directly
returning the `Response.body` or a downstream transformation of the body as
the return value of the transformation function.
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