3.1.0 Release

Adds Email to the Xamarin SDK

• Adds Email to the Xamarin SDK, you can now use setEmail() to set emails for your users

Adds iOS Push Notification Extension Service

• Adds support for iOS notification extension service, which lets applications show rich push notifications (images, buttons, etc)

Other Improvements

• Android API target level 26+ support
• Latest OneSignal native libraries
  • Android SDK 3.8.2
  • iOS SDK 2.8.1
• Fixes a bug where the isAppInFocus property of push notification objects was always false, even if the app was open
• Adds optional callbacks to some methods such as PostNotification()