Update citation to ICLR 2026 paper version (#49)

Author: pjhartout

README.md

@@ -415,13 +415,10 @@ Use `--local` with `--slurm-config` to test the submission pipeline in-process w
 To cite our paper:
 
 ```latex
-@misc{krimmel2025polygraph,
+@inproceedings{krimmel2026polygraph,
   title={PolyGraph Discrepancy: a classifier-based metric for graph generation},
   author={Markus Krimmel and Philip Hartout and Karsten Borgwardt and Dexiong Chen},
-  year={2025},
-  eprint={2510.06122},
-  archivePrefix={arXiv},
-  primaryClass={cs.LG},
-  url={https://arxiv.org/abs/2510.06122},
+  booktitle={International Conference on Learning Representations},
+  year={2026},
 }
 ```