Update citation (#21)

README.md

@@ -72,14 +72,18 @@ coverage run --source=grandiso -m pytest
 If this tool is helpful to your research, please consider citing it with:
 
 ```bibtex
-# https://doi.org/10.1101/2020.06.08.140533
-@article{matelsky_2020_dotmotif,
-    title={{DotMotif: An open-source tool for connectome subgraph isomorphism search and graph queries}},
-    url={http://dx.doi.org/10.1101/2020.06.08.140533},
-    DOI={10.1101/2020.06.08.140533},
-    publisher={Cold Spring Harbor Laboratory},
+# https://doi.org/10.1038/s41598-021-91025-5
+@article{Matelsky_Motifs_2021, 
+    title={{DotMotif: an open-source tool for connectome subgraph isomorphism search and graph queries}},
+    volume={11}, 
+    ISSN={2045-2322}, 
+    url={http://dx.doi.org/10.1038/s41598-021-91025-5}, 
+    DOI={10.1038/s41598-021-91025-5}, 
+    number={1}, 
+    journal={Scientific Reports}, 
+    publisher={Springer Science and Business Media LLC}, 
     author={Matelsky, Jordan K. and Reilly, Elizabeth P. and Johnson, Erik C. and Stiso, Jennifer and Bassett, Danielle S. and Wester, Brock A. and Gray-Roncal, William},
-    year={2020},
+    year={2021}, 
     month={Jun}
 }
 ```