fixed broken bib

NEWPROPOSAL/quantera.bib

@@ -3796,7 +3796,7 @@ well.},
 }
 @article{DKPdW-2019,
-   author={Ross Duncan, Aleks Kissinger, Simon Pedrix, John van de Wetering},
+   author={Ross Duncan and Aleks Kissinger and Simon Pedrix and John van de Wetering},
    title={Graph-theoretic Simplification of Quantum Circuits with the {ZX}-calculus},
    year=2019,
    preprint={arXiv:1902.03178}