Merge #171

171: Update setuptools to 50.0.1 r=duckinator a=pyup-bot


This PR updates [setuptools](https://pypi.org/project/setuptools) from **50.0.0** to **50.0.1**.



<details>
  <summary>Changelog</summary>
  
  
   ### 50.0.1
   ```
   -------

* 2357: Restored Python 3.5 support in distutils.util for missing `subprocess._optim_args_from_interpreter_flags`.
* 2358: Restored AIX support on Python 3.8 and earlier.
* 2361: Add Python 3.10 support to _distutils_hack. Get the &#39;Loader&#39; abstract class
  from importlib.abc rather than importlib.util.abc (alias removed in Python
  3.10).
   ```
   
  
</details>


 

<details>
  <summary>Links</summary>
  
  - PyPI: https://pypi.org/project/setuptools
  - Changelog: https://pyup.io/changelogs/setuptools/
  - Repo: https://github.com/pypa/setuptools
</details>



Co-authored-by: pyup-bot <github-bot@pyup.io>

setup.cfg

@@ -26,7 +26,7 @@ python_requires = >=3.5
 build =
     bork==5.0.0
     pip==20.2.2
-    setuptools==50.0.0
+    setuptools==50.0.1
     wheel==0.35.1
 
 # testing and linting are split, to avoid CI problems