message: Use the right prop type for functions
diff: @@ -38,7 +38,7 @@ export default class Field extends React.PureComponent {
  // changes. Returns an object with `valid` boolean field
  // and a `feedback` react component field to provide feedback
  // to the user.
  - onValidate: PropTypes.function,
  + onValidate: PropTypes.func,
  // All other props pass through to the <input>.
  };
  