Update files from the datasets library (from 1.6.0)

Release notes: https://github.com/huggingface/datasets/releases/tag/1.6.0

README.md

@@ -10,7 +10,7 @@ licenses:
 multilinguality:
 - monolingual
 size_categories:
-- 100k<n<1M
+- 10K<n<100K
 source_datasets:
 - original
 task_categories:

lst20.py

@@ -1,5 +1,3 @@
-from __future__ import absolute_import, division, print_function
-
 import glob
 import os
 from pathlib import Path