Update files from the datasets library (from 1.6.0)

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

qa_zre.py

@@ -1,5 +1,4 @@
 """A dataset reducing relation extraction to simple reading comprehension questions"""
-from __future__ import absolute_import, division, print_function
 
 import csv
 import os