src and placeholder keys doesn't work normal in android

In android devices that I've tested, the image kept in placeholder act as src and the one in src act as placeholder.
```
<ImagePlaceholder
       duration={1000}
       showActivityIndicator={false}
       src='https://s3.amazonaws.com/crisoforo.com/flowers.jpg'
       placeholder='https://s3.amazonaws.com/crisoforo.com/flowers-small.jpg'
       style={styles.img}
       />
```