Release 5.1.0

[jennantilla]

What's Changed

🎉 New Methods 🎉

• Add getter for onesignalId and externalId and a UserState Observer to be notified of changes in #1627
  • See the User Namespace API Reference in the Migration Guide for usage
• Add asynchronous getter methods for Notifications permission and Push Subscription token, id,optedIn in #1649
  • 🛑 Deprecated methods 🛑
    • Notifications.hasPermission, User.pushSubscription.id, User.pushSubscription.token, and User.pushSubscription.optedIn are now deprecated but non-breaking.
  • See the Push Subscription Namespace API Reference and Notifications Namespace API Reference in the Migration Guide for usage of new methods getPermissionAsync, getIdAsync, getTokenAsync, and getOptedInAsync.

⚠️ Minor Breaking Change ⚠️

• API update for PushSubscriptionState: the Push Subscription observer will now be passed nullable properties. Please account for the possibility of the push subscription token and id being null.

Native Changes

• Bump Android Native Version to 5.1.6
• Bump iOS Native Version to 5.1.3

Full Changelog: 5.0.6...5.1.0

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This change is 

[nan-li]

package.json version bump needed

[nan-li]

The release notes look really good