message: add onClick handler to Button
diff: import React from 'react'
  import classnames from 'classnames'
  -const Button = ({ size, type, disabled, block, linkStyle, children }) => (
  +const Button = ({ size, type, disabled, block, linkStyle, onClick, children }) => (
  <button
  disabled={disabled}
  + onClick={onClick}
  type="button"
  className={classnames(
  {
  