Merge pull request #77 from Iterable/doc/change-log

[DOC] - Change log for 6.1.0-beta 2.

Author: tapashmajumder

CHANGELOG.md

@@ -2,6 +2,14 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## 6.1.0-beta2
+#### Added
+- Support for `action://your-custom-action-name` URL scheme for calling custom actions 
+	- For example, to have `IterableCustomActionDelegate` call a custom `buyCoffee` action when a user taps on an in-app message's **Buy** button.
+- Support for reserved `itbl://sdk-custom-action` scheme for SDK internal actions.
+	- URL scheme `itbl://sdk-custom-action` is reserved for internal SDK actions. Do not use it for custom actions. 
+	- For example, future versions of the SDK may allow buttons to call href `itbl://delete` to delete an in-app message.
+
 ## [6.0.8](https://github.com/Iterable/swift-sdk/releases/tag/6.0.8)
 #### Fixed
 - Carthage support with Xcode 10.2
@@ -22,7 +30,6 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 ## 6.1.0-beta1
 #### Added
 - We have improved the in-app messaging implementation significantly. 
-
 	- The SDK now maintains a local queue and keep it in sync with the server-side queue automatically.
 	- Iterable servers now notify apps via silent push messages whenever the in-app message queue is updated.
 	- In-app messages are shown by default whenever they arrive.