Update CHANGELOG.md

Author: AB-xdev

CHANGELOG.md

@@ -3,7 +3,13 @@
 * Minor code improvements, mostly for tests
 * Updated some maven plugins
 
-*NOTE: ``biapi-commercial`` is now a part of the ``csapi`` and open-source*
+*NOTE: ``biapi-commercial`` is now a part of the [``csapi``](https://github.com/xdev-software/csapi) and open-source*
 
 ### Complete overview about the new XDEV (IDE) Framework in version 6
 ![XDEV-IDE-Framework-6 overview](https://user-images.githubusercontent.com/45384811/134640194-0b42a238-3c7e-402a-8b05-51419108dbbd.png)
+
+## 5.0.3+
+Before version 5.0.3, BIAPI was distributed as commercial software. 
+
+To provide this framework as open-source, we split it into two parts: the open-source part you see here and the commercial part, which requires a license. 
+If you want to use the commercial BIAPI with third-party dependencies, please contact us at info@xdev-software.de