setup.cfg some keys added, values are all WIP still

setup.cfg

@@ -3,6 +3,8 @@ name = pEp
 #TODO: automate version pull from hg/git
 version = 2.2.0-RC1
 url = https://pep.foundation
+download_url =
+ext_package = pEp
 author = Volker Birk
 author_email = vb@pep-project.org
 maintainer = Matthias Heckmann
@@ -12,6 +14,7 @@ long_description = file: README.md
 keywords = pEp, crypto, end-to-end, python adapter, key management, high-level
 license = GNU Affero General Public License
 license_files = LICENSE
+platforms = linux, macOs
 classifiers =
     Intended Audience :: Developers
     Topic :: Utilities
@@ -31,7 +34,7 @@ test_suite = tests
 setup_requires =
     setuptools >=38.3.0
 install_requires =
-
+    setuptools >=38.3.0
 tests_require =
     pytest
     tox