Bold the currently selected item in the move list

src/index.css

@@ -48,3 +48,7 @@ ol, ul {
 .game-info {
     margin-left: 20px;
 }
+
+.selected button {
+    font-weight: bolder;
+}

src/index.js

@@ -3,7 +3,6 @@ import ReactDOM from 'react-dom';
 import './index.css';
 
 /*TODO
-    Bold the currently selected item in the move list.
     Rewrite Board to use two loops to make the squares instead of hardcoding them.
     Add a toggle button that lets you sort the moves in either ascending or descending order.
     When someone wins, highlight the three squares that caused the win.
@@ -107,7 +106,7 @@ class Game extends React.Component {
                 'Go to game start' :
                 `Go to move #${index} [${state.playX}, ${state.playY}]`;
             return (
-                <li key={index}>
+                <li key={index} className={index === this.state.currentMoveIndex ? 'selected' : null}>
                     <button onClick={() => this.jumpTo(index)}>{description}</button>
                 </li>
             );