Remove mapHeight and mapWidth prop validation since they're no longer in use

src/components/world-map/world-map.jsx

@@ -75,9 +75,9 @@ const WorldMap = props => (
 WorldMap.propTypes = {
     colorIndex: PropTypes.arrayOf(PropTypes.string),
     countryData: PropTypes.arrayOf(PropTypes.string),
-    countryNames: PropTypes.arrayOf(PropTypes.string),
-    mapHeight: PropTypes.number,
-    mapWidth: PropTypes.number
+    countryNames: PropTypes.arrayOf(PropTypes.string)
+    // mapHeight: PropTypes.number,
+    // mapWidth: PropTypes.number
 };
 
 module.exports = WorldMap;