`resetFormState` handler

[fakenickels]

Will be passed to the children and to the onSubmit handler, so the consumer can programatically reset the form state

[amythos]

hello @grsabreu , i only see the resetFormState handler in onSubmit handler, but not in the children. so i can't reset the form state when i click the cancel button in my form.

[fakenickels]

thanks for the suggestion @amythos , totally makes sense indeed to pass it for the children. Gonna ship this soon.

[fakenickels]

closed by #81