update model card

README.md

@@ -111,7 +111,7 @@ The following hyperparamenters were set on the Fairseq toolkit:
 | Dropout                        	| 0.1                          	|
 | Label smoothing                	| 0.1                          	|
 
-The model was trained using shards of 10 million sentences, for a total of 8.548 updates. Weights were saved every 1000 updates and reported results are the average of the last 4 checkpoints.
+The model was trained using shards of 10 million sentences, for a total of 8.548 updates. Weights were saved every 1000 updates and reported results are the average of the last 8 checkpoints.
 
 ## Evaluation