message: Remove unused ref from Field component
  The `fieldInput` ref is no longer used now that we have controlled components
  everywhere.
diff: @@ -74,7 +74,6 @@ export default class Field extends React.PureComponent {
  // Set some defaults for the <input> element
  inputProps.type = inputProps.type || "text";
  - inputProps.ref = "fieldInput";
  inputProps.placeholder = inputProps.placeholder || inputProps.label;
  inputProps.onChange = this.onChange;
  