Addressing lint errors

src/components/Message/index.js

@@ -1,4 +1,5 @@
 import React from 'react';
+import PropTypes from 'prop-types';
 
 import style from './style.css';
 
@@ -10,4 +11,10 @@ const Message = ({ icon, heading, children }) => {
   </div>;
 };
 
+Message.propTypes = {
+  icon: PropTypes.element,
+  heading: PropTypes.string.isRequired,
+  children: PropTypes.element.isRequired
+};
+
 export default Message;