chore: update issue board link (planning#2016)

README.md

@@ -98,7 +98,7 @@ The client artifact is available in `{projekt.dir}/client/target` after a succes
 - [ ] Destination-API Client
 - [ ] Improved Certificate Handling & Key Generation 
 
-See the [open issues](https://git.fitko.de/fit-connect/planning/-/boards/44?search=SDK) for a full list of proposed features (and known issues).
+See the [open issues](https://git.fitko.de/fit-connect/planning/-/boards/213?label_name[]=team%3A%3ASDK&label_name[]=component%3A%3ASDK%20-%20Java) for a full list of proposed features (and known issues).
 
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