[pre-commit.ci] auto fixes from pre-commit.com hooks

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Author: pre-commit-ci[bot]

docs/paper/paper.md

@@ -18,7 +18,7 @@ authors:
   - name: Nick Hodgskin
     affiliation: 2
   - name: Aart C. Stuurman
-     affiliation: 1 
+     affiliation: 1
   - name: Iury Simoes-Sousa
     orcid: 0000-0002-2484-510X
     affiliation: 3