Destructuring allows me to bypass prop-types rule

When I use this rule:
`"react/prop-types": 2,`

This code

``` js
var testing = this.props.something;
```

yields this

```
  31:33  error  'something' is missing in props validation  react/prop-types
```

which I expect.

When I use destructuring however:

``` js
let {something} = this.props;
```

There is no eslint error.
