Update citation info

CITATION.cff

@@ -0,0 +1,21 @@
+cff-version: 1.2.0
+message: "If you use this software, please cite it as below."
+authors:
+  - given-names: "Elie"
+    family-names: "Bursztein"
+  - given-names: "James"
+    family-names: "Long"
+  - given-names: "Shun"
+    family-names: "Lin"
+  - given-names: "Owen"
+    family-names: "Vallis"
+  - given-names: "Ali"
+    family-names: "Zand"
+  - given-names: "Luke"
+    family-names: "Wood"
+  - given-names: "François"
+    family-names: "Chollet"
+title: "TensorFlow Similarity: Metric Learning for Humans"
+version: 0.18
+date-released: 2023-09-11
+url: "https://github.com/tensorflow/similarity"

README.md

@@ -148,11 +148,12 @@ Tensorflow Similarity offers many of the most common metrics used for [classific
 Please cite this reference if you use any part of TensorFlow similarity in your research:
 
 ```bibtex
-@article{EBSIM21,
-  title={TensorFlow Similarity: A Usable, High-Performance Metric Learning Library},
-  author={Elie Bursztein, James Long, Shun Lin, Owen Vallis, Francois Chollet},
-  journal={Fixme},
-  year={2021}
+@software{TensorFlow_Similarity_2023,
+author = {Elie Bursztein, James Long, Shun Lin, Owen Vallis, Ali Zand, Luke Wood and François Chollet},
+title = {{TensorFlow Similarity: Metric Learning for Humans}},
+url = {https://github.com/tensorflow/similarity},
+version = {0.18},
+year = {2023}
 }
 ```