More day 1 updates

step1-06/final/src/components/TodoListItem.tsx

@@ -3,10 +3,11 @@ import React from 'react';
 export class TodoListItem extends React.Component<any, any> {
   render() {
     const { label, completed } = this.props;
+    // The "no-op" onChange handler prevents a console warning from React at runtime
     return (
       <li className="todo">
         <label>
-          <input type="checkbox" checked={completed} /> {label}
+          <input type="checkbox" checked={completed} onChange={() => undefined} /> {label}
         </label>
       </li>
     );