Update files from the datasets library (from 1.18.0)

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

README.md

@@ -18,9 +18,10 @@ task_categories:
 task_ids:
 - summarization
 paperswithcode_id: null
+pretty_name: Polish Summaries Corpus
 ---
 
-# Dataset Card for polsum
+# Dataset Card for Polish Summaries Corpus
 
 ## Table of Contents
 - [Dataset Description](#dataset-description)
@@ -720,4 +721,4 @@ Single train split
 ```
 ### Contributions
 
-Thanks to [@kldarek](https://github.com/kldarek) for adding this dataset.
+Thanks to [@kldarek](https://github.com/kldarek) for adding this dataset.