fix typo error

Author: ascoders

README.md

@@ -82,7 +82,7 @@ export default class App extends React.Component {
 | flipThreshold          | number                                                                                 | no       | Swipe threshold of the next page                                                                                                                                                                                                     | `80`                                                      |
 | maxOverflow            | number                                                                                 | no       | The X position maximum, that current page can slide to the next page                                                                                                                                                                 | `300`                                                     |
 | index                  | number                                                                                 | no       | Init index of images                                                                                                                                                                                                                 | `0`                                                       |
-| failImageSource        | string, object<br><br>`{uri: string}`                                                  | no       | placeholder for fail                                                                                                                                                                                                                 | `''`                                                      |
+| failImageSource        | string, object<br><br>`{url: string}`                                                  | no       | placeholder for fail                                                                                                                                                                                                                 | `''`                                                      |
 | loadingRender          | function<br><br>`() => React.ReactElement<any>`                                        | no       | placeholder for loading                                                                                                                                                                                                              | `() => null`                                              |
 | onSaveToCamera         | function<br><br>`(index?: number => void`                                              | no       | The callback for save to camera                                                                                                                                                                                                      | `() => {}`                                                |
 | onChange               | function<br><br>`(index?: number => void`                                              | no       | When the image changed                                                                                                                                                                                                               | `() => {}`                                                |