updating useAsyncStorage syntax

[idkjs]

Lets user do:

ReactNativeAsyncStorage.asyncStorageState

type asyncStorageState = {
  getItem: unit => Js.Promise.t(Js.Null.t(string)),
  setItem: string => Js.Promise.t(unit),
  mergeItem: string => Js.Promise.t(unit),
  removeItem: unit => Js.Promise.t(unit),
};

let key = "@@Key"
 let ReactNativeAsyncStorage.{getItem, setItem} =
    ReactNativeAsyncStorage.useAsyncStorage("@@Key");

Instead of

 let useAsyncStorage=
    ReactNativeAsyncStorage.useAsyncStorage("@@Key");

let getItem =useAsyncStorage##getItem;

See updated README.md

[MoOx]

Thanks for this PR! Could the example be more straight forward without styles for example? To avoid unecessary noise so the developer can focus on the actual interesting code, thanks!

[idkjs]

@MoOx #4 (review) done

[MoOx]

I removed example as they were way to complex to quickly illustrate how to use the hook. If you want to another PR, but without UI & faker & unecessary stuff for the developer to understand the core of the usage.

[MoOx]

I rolled back the change and added record syntax as useAsyncStorage_ with a deprecation notice for old syntax.