https://jistol.github.io/frontend/2018/12/03/react-proptypes/
https://medium.com/@sangboaklee/react-proptypes-%ED%99%9C%EC%9A%A9%ED%95%98%EA%B8%B0-7a0615da236
https://blog.coderifleman.com/2015/06/24/learning-react-2/
Search.propTypes = {
onKeyUp: PropTypes.func.isRequired,
placeHolder: PropTypes.string
}
<Search onKeyUp={} placeHolder="TEST"/>