[change] Remove AsyncStorage

Ref #1352
Ref react-native-async-storage/async-storage#52
Ref facebook/react-native#23313

Author: enigmaticsoul216

README.md

@@ -167,7 +167,6 @@ React Native v0.55
 | Animated                 | ✓      | Missing `useNativeDriver` support. |
 | AppRegistry              | ✓      | Includes additional support for server rendering with `getApplication`. |
 | AppState                 | ✓      |  |
-| AsyncStorage             | ✓      |  |
 | BackHandler              | (✓)    | Mock. No equivalent web APIs. |
 | CameraRoll               | ✘      | No equivalent web APIs. |
 | Clipboard                | ✓      |  |

packages/babel-plugin-react-native-web/src/moduleMap.js

@@ -6,7 +6,6 @@ module.exports = {
   Animated: true,
   AppRegistry: true,
   AppState: true,
-  AsyncStorage: true,
   BackHandler: true,
   Button: true,
   CameraRoll: true,