Update README.md

README.md

@@ -23,9 +23,9 @@ To use this dataset, you need to install [ConvLab-3](https://github.com/ConvLab/
 ```
 from convlab.util import load_dataset, load_ontology, load_database
 
-dataset = load_dataset('sgd2')
-ontology = load_ontology('sgd2')
-database = load_database('sgd2')
+dataset = load_dataset('sgd5')
+ontology = load_ontology('sgd5')
+database = load_database('sgd5')
 ```
 For more usage please refer to [here](https://github.com/ConvLab/ConvLab-3/tree/master/data/unified_datasets).