useForm config not generic + pass form values to config

[Jephuff]

Just a couple small tweaks to the typescript file.

1. The config being a generic meant it accepted any argument, this changes it so it's typed as config so you will get errors passing an invalid config.
2. Pass the form values along to the final-form config type.

[codecov]

Codecov Report

Merging #57 into master will not change coverage.
The diff coverage is n/a.

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  Hits           83     83

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[LinusU]

Yes please 😍

It seems a bit strange at the moment that useForm<{ a: string }>() doesn't create a form with a single field, a, that's a string. This will make it much much easier to specify the shape of the form! 👏

[yunyu]

@erikras Would you mind taking a look at this?

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.