Update paper/paper.md

Co-authored-by: Joshua Lampert <51029046+JoshuaLampert@users.noreply.github.com>

Author: ranocha

paper/paper.md

@@ -16,7 +16,7 @@ authors:
 affiliations:
  - name: Institute of Mathematics, University of Kassel, Germany
    index: 1
- - name: Institute of Mathematics, University of Hamburg, Germany
+ - name: Department of Mathematics, University of Hamburg, Germany
    index: 2
  - name: Institute of Mathematics, Johannes Gutenberg University Mainz, Germany
    index: 3