added breaking change informatioN

Author: mariodavid

CHANGELOG.md

@@ -11,7 +11,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ### Change
 - BREAKING: Storage format for message record references has been changed. In order to migrate to the new storage format
-you have to download `etc/migrate-message-records-to-new-format.zip` from this repository and run it in the [Diagnose Wizard](https://github.com/mariodavid/cuba-component-runtime-diagnose/tree/de284e5cbce19bb02260b59b9dcd133f2729b0e3#diagnose-wizard).
+you have to download [etc/migrate-message-records-to-new-format.zip](
+) from this repository and run it in the [Diagnose Wizard](https://github.com/mariodavid/cuba-component-runtime-diagnose/tree/de284e5cbce19bb02260b59b9dcd133f2729b0e3#diagnose-wizard).
 For that to work you have to temporarily add the [runtime-diagnose](https://github.com/mariodavid/cuba-component-runtime-diagnose) app-component to your application.
 This script has to run once, will do the migration. After that, the app component can be removed again.
 

README.md

@@ -26,7 +26,7 @@ This CUBA component gives users a mailbox for user to user and system to user me
 
 | Platform Version | Add-on Version |
 | ---------------- | -------------- |
-| 6.8.x            | 0.1.x - 0.2.x  |
+| 6.8.x            | 0.1.x - 0.3.x  |
 
 The latest version is: [ ![Download](https://api.bintray.com/packages/mariodavid/cuba-components/cuba-component-user-inbox/images/download.svg) ](https://bintray.com/mariodavid/cuba-components/cuba-component-user-inbox/_latestVersion)
 
@@ -42,6 +42,10 @@ dependencies {
 }
 ```
 
+### NOTE: BREAKING CHANGE in 0.3.0
+There is a breaking change if you update from 0.2.0 to 0.3.0. The mechanism how the record references are stored to a message
+changed. It can be resolved with manual action. See [CHANGELOG.md](https://github.com/mariodavid/cuba-component-user-inbox/blob/master/CHANGELOG.md) for more information.
+
 ### NOTE: Dependency: declarative-controllers
 This application component requires `declarative-controllers` as another dependency you have to add to your application.