Update files from the datasets library (from 1.6.0)

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

xsum_factuality.py

@@ -14,7 +14,6 @@
 # limitations under the License.
 """XSum Hallucination Annotations: Faithfulness and factuality annotations of XSum summaries"""
 
-from __future__ import absolute_import, division, print_function
 
 import csv
 import os