Remove dangling references to six compatibility library

Author: ralish

draftable/endpoints/comparisons/sides.py

@@ -1,7 +1,5 @@
 from os.path import basename, isfile, join, splitext
 
-from six import string_types
-
 # urllib3 is a required dependency of requests
 from urllib3.util import parse_url
 
@@ -67,7 +65,7 @@ def data_from_side(side_name, side):
     for a comparison POST request as a dictionary.
     """
 
-    if isinstance(side, string_types):
+    if isinstance(side, str):
         # User has provided a file path or URL.
         side = make_side(side)
 

setup.cfg

@@ -74,7 +74,6 @@ dev =
     tox >= 3.3.0
     twine
     types-requests
-    types-six
     wheel
 
 [options.packages.find]