Update files from the datasets library (from 1.6.0)

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

ropes.py

@@ -15,7 +15,6 @@
 """ROPES dataset.
 Code is heavily inspired from https://github.com/huggingface/datasets/blob/master/datasets/squad/squad.py"""
 
-from __future__ import absolute_import, division, print_function
 
 import json
 import os