message: fix PropTypes.oneOfType
diff: @@ -52,7 +52,7 @@ module.exports = createReactClass({
  // Extra node inserted after picker input, dropdown and errors
  extraNode: PropTypes.node,
  value: PropTypes.string,
  - placeholder: PropTypes.oneOfType(PropTypes.string, PropTypes.func),
  + placeholder: PropTypes.oneOfType([PropTypes.string, PropTypes.func]),
  roomId: PropTypes.string,
  button: PropTypes.string,
  focus: PropTypes.bool,
  