Enabling backgroundOpacity and foregroundOpacity for ContentLoader on Native. in README.md

Updated docs to describe `backgourndOpacity` and `foregroundOpacity` props of `ContentLoader` available in React Native environment.

Author: DrStoop

README.md

@@ -119,8 +119,8 @@ const MyLoader = () => (
 | **`rtl?: boolean`** <br /> Defaults to `false`                   | React DOM<br/>React Native | Content right-to-left.                                                                                                                                                                                                                                                                              |
 | **`backgroundColor?: string`** <br /> Defaults to `#f5f6f7`      | React DOM<br/>React Native | Used as background of animation.                                                                                                                                                                                                                                                                    |
 | **`foregroundColor?: string`** <br /> Defaults to `#eee`         | React DOM<br/>React Native | Used as the foreground of animation.                                                                                                                                                                                                                                                                |
-| **`backgroundOpacity?: number`** <br /> Defaults to `1`          | React DOM only             | Background opacity (0 = transparent, 1 = opaque)<br/>used to solve an issue in [Safari](#safari--ios)                                                                                                                                                                                               |
-| **`foregroundOpacity?: number`** <br /> Defaults to `1`          | React DOM only             | Animation opacity (0 = transparent, 1 = opaque)<br/>used to solve an issue in [Safari](#safari--ios)                                                                                                                                                                                                |
+| **`backgroundOpacity?: number`** <br /> Defaults to `1`          | React DOM<br/>React Native | Background opacity (0 = transparent, 1 = opaque)<br/>used to solve an issue in [Safari](#safari--ios)                                                                                                                                                                                               |
+| **`foregroundOpacity?: number`** <br /> Defaults to `1`          | React DOM<br/>React Native | Animation opacity (0 = transparent, 1 = opaque)<br/>used to solve an issue in [Safari](#safari--ios)                                                                                                                                                                                                |
 | **`style?: React.CSSProperties`** <br /> Defaults to `{}`        | React DOM only             |                                                                                                                                                                                                                                                                                                     |
 | **`uniqueKey?: string`** <br /> Defaults to random unique id     | React DOM only             | Use the same value of prop key, <br/>that will solve inconsistency on the SSR, see more [here](https://github.com/danilowoz/react-content-loader/issues/78).                                                                                                                                        |
 | **`beforeMask?: JSX.Element`** <br /> Defaults to null           | React DOM<br/>React Native | Define custom shapes before content, <br/>see more [here](https://github.com/danilowoz/react-content-loader/issues/266).                                                                                                                                                                            |