Fix spelling error

cal_tools/cal_tools/tools.py

@@ -3,7 +3,7 @@ import datetime
 from glob import glob
 from importlib.machinery import SourceFileLoader
 import json
-from os import chdir, environ, listdir, makedirs, path, remove, stat,
+from os import chdir, environ, listdir, makedirs, path, remove, stat
 from os.path import isdir, isfile, splitext
 from queue import Queue
 import re