Merge #125

125: Update setuptools to 46.4.0 r=duckinator a=pyup-bot


This PR updates [setuptools](https://pypi.org/project/setuptools) from **46.3.1** to **46.4.0**.



<details>
  <summary>Changelog</summary>
  
  
   ### 46.4.0
   ```
   -------

* 1753: ``attr:`` now extracts variables through rudimentary examination of the AST,
  thereby supporting modules with third-party imports. If examining the AST
  fails to find the variable, ``attr:`` falls back to the old behavior of
  importing the module. Works on Python 3 only.
   ```
   
  
</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

@@ -36,7 +36,7 @@ tests_require =
 # FIXME: This name seems wrong, but I can't think of a better one atm.
 build =
     pip==20.1
-    setuptools==46.3.1
+    setuptools==46.4.0
     wheel==0.34.2
 
 testing =