Add step number to headers

step2-02/exercise/src/components/TodoHeader.tsx

@@ -5,7 +5,7 @@ export class TodoHeader extends React.Component<{}, {}> {
   render() {
     return (
       <div>
-        <h1>todos</h1>
+        <h1>todos - step2-02 exercise</h1>
         <input className="textfield" placeholder="add todo" />
         <button className="button add">Add</button>
         <div className="filter">