setup.{py,cfg}: Convert more from setup.py into setup.cfg .

Also, get rid of detailed python version classifiers, I guess they do not
mean much.

Author: vpelletier

README.rst

@@ -1,4 +1,4 @@
-Pure-python wrapper for libusb-1.0
+.. contents::
 
 Supports all transfer types, both in synchronous and asynchronous mode.
 

setup.cfg

@@ -1,3 +1,31 @@
+[metadata]
+name = libusb1
+url = https://github.com/vpelletier/python-libusb1
+author = Vincent Pelletier
+author_email = plr.vincent@gmail.com
+classifiers =
+  Intended Audience :: Developers
+  License :: OSI Approved :: GNU Lesser General Public License v2 or later (LGPLv2+)
+  Operating System :: OS Independent
+  Programming Language :: Python :: 3
+  Programming Language :: Python :: Implementation :: CPython
+  Programming Language :: Python :: Implementation :: PyPy
+  Topic :: Software Development :: Libraries
+  Topic :: System :: Hardware :: Hardware Drivers
+license = LGPLv2.1+
+description = Pure-python wrapper for libusb-1.0
+long_description = file: README.rst
+keywords = usb, libusb
+platforms = any
+
+[options]
+packages = find:
+# For backward compatibility with python-libusb1 < 1.6
+py_modules = libusb1
+
+[options.package_data]
+usb1 = libusb-1.0.dll
+
 [versioneer]
 VCS = git
 style = pep440

setup.py

@@ -14,7 +14,6 @@
 # License along with this library; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 
-from setuptools import find_packages
 from setuptools import setup
 from setuptools import Command
 from codecs import open
@@ -144,47 +143,15 @@ def run(self):
             )
 cmdclass['update_libusb'] = update_libusb
 
-long_description = open(
-    os.path.join(os.path.dirname(__file__), 'README.rst'),
-    encoding='utf8',
-).read()
-
 setup(
-    name='libusb1',
-    description=next(x for x in long_description.splitlines() if x.strip()),
-    long_description='.. contents::\n\n' + long_description,
-    keywords='usb libusb',
     version=versioneer.get_version(),
     cmdclass=cmdclass,
-    author='Vincent Pelletier',
-    author_email='plr.vincent@gmail.com',
-    url='http://github.com/vpelletier/python-libusb1',
-    license='LGPLv2.1+',
-    platforms=['any'],
-    py_modules=['libusb1'],
-    packages=find_packages(),
-    package_data={
-        "usb1": ["libusb-1.0.dll"],
-    },
+
     entry_points={
         'pyinstaller40': [
             'hook-dirs=usb1.__pyinstaller:get_hook_dirs',
             'tests=usb1.__pyinstaller:get_PyInstaller_tests']
     },
-    classifiers=[
-        'Intended Audience :: Developers',
-        'License :: OSI Approved :: GNU Lesser General Public License v2 or later (LGPLv2+)',
-        'Operating System :: OS Independent',
-        'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.4',
-        'Programming Language :: Python :: 3.5',
-        'Programming Language :: Python :: 3.6',
-        'Programming Language :: Python :: 3.7',
-        'Programming Language :: Python :: Implementation :: CPython',
-        'Programming Language :: Python :: Implementation :: PyPy',
-        'Topic :: Software Development :: Libraries',
-        'Topic :: System :: Hardware :: Hardware Drivers',
-    ],
     setup_requires=(
         ['wheel']
         if 'bdist_wheel' in sys.argv else