modernize setup.py

Author: liske

setup.cfg

@@ -18,13 +18,11 @@ def version():
     author = 'Thomas Liske',
     author_email = 'thomas@fiasko-nw.net',
     url = 'https://github.com/liske/python-apds9960/',
-    download_url = 'https://github.com/liske/python-apds9960/archive/0.2.tar.gz',
     keywords = 'apds9960',
     license='GPLv3+',
     long_description=open('README.md', 'r').read(),
     long_description_content_type='text/markdown',
     classifiers = [
-        'License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)',
         'Programming Language :: Python',
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 3',