Courier iOS 4.0+ SDK is Live

Courier iOS 4.0+ SDK is live! 🙌

Check out the [repository](https://github.com/trycourier/courier-ios)

**Upgrade includes:**

- Low-level [API client](https://github.com/trycourier/courier-ios/blob/master/Docs/Client.md). Every API is accessible now!

- 41 new tests are written to cover every feature of the SDK

- CourierInbox and CourierPreferences views are even more reliable and handle more edge cases

- Concurrency for Inbox was rewritten to prevent all race conditions

- Simplified docs and SwiftUI snippets

- 41 new pre-release tests written to cover all APIs and use cases