0.13

- [ ] Add `trim` option which gets passed as an option to get-form-data
- [ ] Set `form.data` to the first displayed value for Selects with choices but without an initial value so it matches up with what's selected by default.
- [ ] Set `form.data` to the first displayed value if a Select's choices go from empty to non-empty and there is no user input yet (#69) - might need extra checks and/or warnings if there are scenarios which leave uncontrolled inputs in an inconsistent state.