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• Change `TrackEvent` function to get also a listener as parameter

  For now `TrackEvent` only sends the event to our server without any indication for the user if it succeeded. The new `TrackEvent` function will receive also a `AppsFlyerTrackingRequestListener` which will have 2 callbacks: `onTrackingRequestSuccess()` and `onTrackingRequestFailure(String error)`

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• Add user invite functionality

  Expose user invite functionality from our sdk: In this way the users can share a customised link with others, and you can track user invites later from our dashboard. For more details look at: https://support.appsflyer.com/hc/en-us/articles/115004480866-User-invite-attribution

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