fix github url

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

README.md

@@ -129,7 +129,7 @@ The dataset is curated by the [Deep Search team](https://ds4sd.github.io/) at IB
 You can contact us at [deepsearch-core@zurich.ibm.com](mailto:deepsearch-core@zurich.ibm.com).
 
 Curators:
-- Christoph Auer, [@cau-git](https://github.com/dolfim-ibm)
+- Christoph Auer, [@cau-git](https://github.com/cau-git)
 - Michele Dolfi, [@dolfim-ibm](https://github.com/dolfim-ibm)
 - Ahmed Nassar, [@nassarofficial](https://github.com/nassarofficial)
 - Peter Staar, [@PeterStaar-IBM](https://github.com/PeterStaar-IBM)
@@ -162,4 +162,4 @@ License: [CDLA-Permissive-1.0](https://cdla.io/permissive-1-0/)
 
 ### Contributions
 
-Thanks to [@dolfim-ibm](https://github.com/dolfim-ibm), [@cau-git](https://github.com/dolfim-ibm) for adding this dataset.
+Thanks to [@dolfim-ibm](https://github.com/dolfim-ibm), [@cau-git](https://github.com/cau-git) for adding this dataset.