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:
 - open-domain-qa
 - extractive-qa
 paperswithcode_id: covidqa
+pretty_name: CovidQaCastorini
 ---
 
 
@@ -176,4 +177,4 @@ the [Apache License 2.0](https://github.com/castorini/pygaggle/blob/master/LICEN
 
 ### Contributions
 
-Thanks to [@olinguyen](https://github.com/olinguyen) for adding this dataset.
+Thanks to [@olinguyen](https://github.com/olinguyen) for adding this dataset.