setup.py: min python version

setup.py

@@ -14,7 +14,10 @@ setup(
     author = 'pictuga',
     author_email = 'contact@pictuga.com',
     url = 'http://morss.it/',
-    download_url = 'https://git.pictuga.com/pictuga/morss',
+    project_urls = {
+        'Source': 'https://git.pictuga.com/pictuga/morss',
+        'Bug Tracker': 'https://github.com/pictuga/morss/issues',
+    },
     license = 'AGPL v3',
     packages = [package_name],
     install_requires = ['lxml', 'bs4', 'python-dateutil', 'chardet'],
@@ -22,6 +25,7 @@ setup(
         'full': ['pymysql', 'redis', 'diskcache', 'gunicorn'],
         'dev': ['pylint']
     },
+    python_requires = '>=2.7',
     package_data = {package_name: ['feedify.ini']},
     data_files = [
         ('share/' + package_name, ['README.md', 'LICENSE']),