Update README.md

README.md

@@ -22,6 +22,7 @@ task_categories:
 To use this dataset, you need to install [ConvLab-3](https://github.com/ConvLab/ConvLab-3) platform first. Then you can load the dataset via:
 ```
 from convlab.util import load_dataset, load_ontology, load_database
+
 dataset = load_dataset('sgd2')
 ontology = load_ontology('sgd2')
 database = load_database('sgd2')