Fix setup.py to work with setuptools 41.4.0 and later

Manually parsing setup.cfg and passing the parsed data into the setup
function is not officially supported by setuptools (see
pypa/setuptools#1869) and is also unnecessary, because the setup
function will automatically read the relevant data from setup.cfg.

Author: dgelessus

setup.py

@@ -1,10 +1,3 @@
-import os
 from setuptools import setup
-from setuptools.config import read_configuration
 
-this_dir = os.path.dirname(__file__)
-cfg = read_configuration(os.path.join(this_dir, 'setup.cfg'))
-cfg["options"].update(cfg["metadata"])
-cfg = cfg["options"]
-
-setup(**cfg)
+setup()