setup.py: update licence info

setup.py

@@ -7,7 +7,7 @@ setup(
     author='pictuga, Samuel Marks',
     author_email='contact at pictuga dot com',
     url='http://morss.it/',
-    license='GPL 3+',
+    license='AGPL v3',
     package_dir={package_name: package_name},
     packages=find_packages(),
     package_data={package_name: ['feedify.ini', 'reader.html.template']},