Iterable/swift-sdk 6.3.0-beta3 on GitHub

Support for syncing in-app message read state across multiple devices:
- When the SDK fetches in-app messages from Iterable, it examines each
  message's read field to determine if it has already been read.
- The SDK's default implementation no longer automatically displays in-app
  messages that have already been seen on another device (even if those
  messages were not configured to go directly to the inbox).
- When you view a message, the SDK calls POST /api/events/trackInAppOpen
  to create an inAppOpen event on the user's Iterable profile. Previous
  versions of the SDK made this same API call, but the call now also causes
  Iterable to set the message's read field to true.
- Previous versions of the SDK will correctly sync a message's read / unread
  indicator for the default implementation of a mobile inbox. However, these
  older SDK versions will not automatically suppress messages that have
  already been seen on another device (as this version of the SDK will).
Support for the display of a custom message (title and body) in an empty
mobile inbox. For more details, see Customizing Mobile Inbox on iOS