Update files from the datasets library (from 1.3.0)

Release notes: https://github.com/huggingface/datasets/releases/tag/1.3.0

README.md

@@ -185,4 +185,7 @@ The licensing status of the dataset hinges on the legal status of the [Pushshift
     url = "https://www.aclweb.org/anthology/2020.emnlp-main.531",
     pages = "6556--6566"
 }
-```
+```
+### Contributions
+
+Thanks to [@zhongpeixiang](https://github.com/zhongpeixiang) for adding this dataset.