Replace use of six.text_type with str

This removes the last use of the six package allowing Sphinx to remove
it as a dependency.

1 files changed, 0 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index 50c4b3f3a..6e28a10fc 100644
--- a/setup.py
+++ b/setup.py
@@ -15,7 +15,6 @@ if sys.version_info < (3, 5):
     sys.exit(1)
 
 install_requires = [
-    'six>=1.5',
     'Jinja2>=2.3',
     'Pygments>=2.0',
     'docutils>=0.12',