Add custom source for avatar picture while conserving default bongo cat picture

components/Avatar.js

@@ -6,7 +6,7 @@ export default function Avatar(props) {
   return (
     <img
       className={styles[props.size]}
-      src="/images/bongo.png"
+      src={props.src}
       alt="The one and only bongo cat!"
     />
   );
@@ -14,4 +14,9 @@ export default function Avatar(props) {
 
 Avatar.propTypes = {
   size: PropTypes.string.isRequired,
+  src: PropTypes.string
+};
+
+Avatar.defaultProps = {
+  src: "/images/bongo.png"
 };