Update files from the datasets library (from 1.18.0)

Release notes: https://github.com/huggingface/datasets/releases/tag/1.18.0

README.md

@@ -19,6 +19,7 @@ task_ids:
 - closed-domain-qa
 - extractive-qa
 paperswithcode_id: null
+pretty_name: COVID-QA
 ---
 
 
@@ -169,4 +170,4 @@ The Proto_qa dataset is licensed under the [Apache License 2.0](https://github.c
 
 ### Contributions
 
-Thanks to [@olinguyen](https://github.com/olinguyen) for adding this dataset.
+Thanks to [@olinguyen](https://github.com/olinguyen) for adding this dataset.