[Hierarchical BVAR pymc-devs#286] added new line to end of bib file

Signed-off-by: Nathaniel <[email protected]>

Author: NathanielF

examples/references.bib

@@ -650,4 +650,4 @@ @article{zhang2021pathfinder
   author        = {Zhang, Lu and Carpenter, Bob and Gelman, Andrew and Vehtari, Aki},
   journal       = {arXiv preprint arXiv:2108.03782},
   year          = {2021}
-}
+}