Drop six from requirements

It was necessary when we had to maintain Python 2/3 compatibility.

closes #43

Author: brunobord

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 - Drop Python 2 Support (#37).
 - Drop Django 1.11 support (#40).
+- Remove `six` from the requirements (#43).
 
 ## 1.5.0 (2020-02-05)
 

demo/demo_chunkator/tests.py

@@ -1,4 +1,4 @@
-import six
+from io import StringIO
 
 from django.test import TestCase
 
@@ -146,7 +146,7 @@ def test_chunk_uuid(self):
     def test_chunk_missing_pk(self):
         with self.assertRaises(MissingPkFieldException):
             result = chunkator(User.objects.all().values("name"), 10)
-            six.next(result)
+            next(result)
 
 
 class ChunkatorWhereTest(TestCase):
@@ -157,7 +157,7 @@ def setUp(self):
         User.objects.create(name='ChuckNorris')
 
     def test_query_log(self):
-        query_log_output = six.StringIO()
+        query_log_output = StringIO()
         qs = User.objects.all()
         # We loop here only to dig into the generator and force execution
         for item in chunkator(qs, 1, query_log=query_log_output):

setup.py

@@ -58,7 +58,7 @@ def namespace_packages(project_name):
 
 name = 'django-chunkator'
 readme = read_relative_file('README.rst')
-requirements = ['six', 'django']
+requirements = ['django']
 entry_points = {}