confused viewBox in react-native

## What did you do?
Please include the actual source code causing the issue.
```
import React from 'react'
import ContentLoader, { Rect } from 'react-content-loader/native'

const MyLoader = (props) => (




)

export default MyLoader
```

```
// use

```

## What did you expect to happen?
Please mention the expected behaviour.

## What happened actually?

### Which versions of react-content-loader, and which browser are affected by this issue?
Please also mention the version of react.