Support getVersion in React Native app

[peteroid]

Currently, the app version is not being logged. The prop version_name is null in the form data of the POST api.amplitude.com requests.

However, we can explicitly set the version name as following.

import { getVersion } from 'react-native-device-info'
import Amplitude from 'amplitude-js'
// ...
Amplitude.getInstance().setVersionName(getVersion())
// ...

Is it possible to add getVersion to the array here https://github.com/amplitude/Amplitude-JavaScript/blob/master/src/amplitude-client.js#L191 ?

ref:

• https://github.com/react-native-community/react-native-device-info#getversion