Any reason we couldn't remove React as a dependency and make it a peer dependency?

It's depending on a now ancient version. It seems like it would be better to use:

```js
peerDependencies: {
  "react": "*"
}
```

I haven't tested it, but I don't think this package has an requirement for React 15 specifically, right @raphasilvac ?

Thanks for the great module! It's the only one that seems to get the job done!