Update links in Readme.md
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## Development and License
### RKorAPClient
-**Authors**: [Marc Kupietz](http://www1.ids-mannheim.de/zfo/personal/kupietz/), [Nils Diewald](http://www1.ids-mannheim.de/zfo/personal/diewald/)
+**Authors**: [Marc Kupietz](https://www.ids-mannheim.de/digspra/personal/kupietz/), [Nils Diewald](https://www.ids-mannheim.de/digspra/personal/diewald/)
Copyright (c) 2023, [Leibniz Institute for the German Language](http://www.ids-mannheim.de/), Mannheim, Germany