Add EMNLP announcement.

README.md

@@ -42,7 +42,21 @@ We encourage you to use the [beginner's tutorial](https://colab.research.google.
 
 ## Citing
 
-If you use EUD in your research, please cite [COMBO: A New Module for EUD Parsing](https://aclanthology.org/2021.iwpt-1.16/)
+### Accepted at EMNLP'21 demo session :tada: :fire:
+
+If you use COMBO in your research, please cite [COMBO: State-of-the-Art Morphosyntactic Analysis](https://arxiv.org/abs/2109.05361)
+```bibtex
+@misc{klimaszewski2021combo,
+      title={COMBO: State-of-the-Art Morphosyntactic Analysis}, 
+      author={Mateusz Klimaszewski and Alina Wróblewska},
+      year={2021},
+      eprint={2109.05361},
+      archivePrefix={arXiv},
+      primaryClass={cs.CL}
+}
+```
+
+If you use an EUD module in your research, please cite [COMBO: A New Module for EUD Parsing](https://aclanthology.org/2021.iwpt-1.16/)
 ```bibtex
 @inproceedings{klimaszewski-wroblewska-2021-combo,
     title = "{COMBO}: A New Module for {EUD} Parsing",