change todo to todoIndex in App.js
change todo to todoIndex in App.js

In line 156-158 :
```js
 <Todo {...todo}
                key={index}
                onClick={() => this.props.onTodoClick(index)} />
```

There is index of todo.
But in the line 239-249:

```js
<TodoList
          todos={[{
            text: 'Use Redux',
            completed: true
          }, {
            text: 'Learn to connect it to React',
            completed: false
          }]}
          onTodoClick={todo=>
            console.log('todo clicked', todo)
          } />
```
There become just the `todo`,
I think change it to `todoIndex` would be clearer and less ambiguous than just `todo`.
roth1002/redux,splendido/redux,dieface/redux,joaomilho/redux,neighborhood999/redux,james4388/redux,lifeiscontent/redux,hallettj/redux,mjasinski5/redux,lifeiscontent/redux,tatsuhino/reactPractice,jas-chen/redux,mjw56/redux,mikekidder/redux,roth1002/redux,doerme/redux,camsong/redux,neighborhood999/redux,contolini/redux,leoasis/redux,tappleby/redux,Aweary/redux,doerme/redux,Aweary/redux,andreieftimie/redux,gaearon/redux,gaearon/redux,tappleby/redux,ellbee/redux,jas-chen/typed-redux,kevinold/redux,ptkach/redux,jdlehman/redux,joaomilho/redux,tatsuhino/reactPractice,jas-chen/redux,naoishii/ohk2016C,edge/redux,chentsulin/redux,gajus/redux,joshwreford/idle-game,tappleby/redux,keyanzhang/redux,paulkogel/redux,CompuIves/redux,okmttdhr/redux-with-comment,JoeStanton/redux,chentsulin/redux,mjw56/redux,conorhastings/redux,joshwreford/idle-game,jas-chen/typed-redux,splendido/redux,bvasko/redux,ptkach/redux,ide/redux,CompuIves/redux,bvasko/redux,ssk7833/redux,javascriptjedi/redux-select