message: Use input element's value directly
  Since we're keeping the input as a ref anyway, let's use that rather than
  requiring the value to be passed to `validate`. This allows others to call
  `validate` as well.
diff: @@ -55,7 +55,6 @@ export default class Field extends React.PureComponent {
  onFocus = (ev) => {
  this.validate({
  - value: ev.target.value,
  focused: true,
  });
  // Parent component may have supplied its own `onFocus` as well
  @@ -66,7 +65,6 @@ export default class Field extends React.PureComponent {
  onChange = (ev) => {
  this.validate({
  - value: ev.target.value,
  focused: true,
  });
  // Parent component may have supplied its own `onChange` as well
  @@ -77,7 +75,6 @@ export default class Field extends React.PureComponent {
  onBlur = (ev) => {
  this.validate({
  - value: ev.target.value,
  focused: false,
  });
  // Parent component may have supplied its own `onBlur` as well
  @@ -90,10 +87,11 @@ export default class Field extends React.PureComponent {
  this.input.focus();
  }
  - validate({ value, focused }) {
  + validate({ focused }) {
  if (!this.props.onValidate) {
  return;
  }
  + const { value } = this.input;
  const { valid, feedback } = this.props.onValidate({
  value,
  focused,
  