Added ACL link for paper

README.md

@@ -11,7 +11,7 @@ language:
 ## Pretrained BERT model for Romanian 
 
 Pretrained model on Romanian language using a masked language modeling (MLM) and next sentence prediction (NSP) objective. 
-It was introduced in this [paper](https://www.blank.org/). Three BERT models were released: **RoBERT-small**, RoBERT-base and RoBERT-large, all versions uncased.
+It was introduced in this [paper](https://www.aclweb.org/anthology/2020.coling-main.581/). Three BERT models were released: **RoBERT-small**, RoBERT-base and RoBERT-large, all versions uncased.
 
 | Model          | Weights   |   L    |   H    |    A   | MLM accuracy   | NSP accuracy   |
 |----------------|:---------:|:------:|:------:|:------:|:--------------:|:--------------:|