Add migration advisory to readme and migration guide

OneSignal / OneSignal-Flutter-SDK

OneSignal is a free push notification service for mobile apps. This plugin makes it easy to integrate your flutter app with OneSignal

https://www.onesignal.com

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Closed jennantilla closed 2 months ago

jennantilla commented 2 months ago

This PR adds a feature parity migration advisory to the migration guide and README.md

This change is