fix linter errors

Author: tien-tong

cubids/cubids.py

@@ -5,13 +5,13 @@
 """
 
 import csv
-from concurrent.futures import ProcessPoolExecutor
 import json
 import os
 import re
 import subprocess
 import warnings
 from collections import defaultdict
+from concurrent.futures import ProcessPoolExecutor
 from pathlib import Path
 from shutil import copyfile, copytree