Fix year in noisy channel citation
Summary:
2018->2019
Pull Request resolved:
@@ -3,7 +3,7 @@ This page contains pointers to pre-trained models as well as instructions on how
## Citation:
```bibtex
-@inproceedings{yee2018simple,
+@inproceedings{yee2019simple,
title = {Simple and Effective Noisy Channel Modeling for Neural Machine Translation},
author = {Kyra Yee and Yann Dauphin and Michael Auli},
booktitle = {Conference on Empirical Methods in Natural Language Processing},
