v0.5.9

What's new

1. The library now exports a simple create function which you can use to create a useMMKVStorage hook.
2. The useMMKVStorage hook now supports setter functions. #98 Thanks to @SaltedBlowfish

What's fixed

1. useMMKVStorage return value if it exists on init #105 by @vokhuyetOz
2. Minor fixes in the docs.