Update paper

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paper.bib

@@ -124,7 +124,7 @@ @Article{Pappalardo2022
 @article{Oshan_2016,
   title={A primer for working with the Spatial Interaction modeling (SpInt) module in the python spatial analysis library (PySAL)}, 
   volume={3},
-  doi={10.18335/region.v3i2.175}
+  doi={10.18335/region.v3i2.175},
   number={2},
   journal={REGION},
   author={Oshan, Taylor M},